{"id":715,"date":"2019-01-23T18:45:26","date_gmt":"2019-01-24T01:45:26","guid":{"rendered":"https:\/\/blogs.ubc.ca\/mrpletsch\/?p=715"},"modified":"2020-02-27T20:00:43","modified_gmt":"2020-02-28T03:00:43","slug":"phylum-cnidaria","status":"publish","type":"post","link":"https:\/\/blogs.ubc.ca\/mrpletsch\/2019\/01\/23\/phylum-cnidaria\/","title":{"rendered":"Unit 5-2: Phylum Cnidaria"},"content":{"rendered":"<h3>Phylum Cnidaria &#8211; Basics<\/h3>\n<ul>\n<li><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-716\" src=\"https:\/\/blogs.ubc.ca\/mrpletsch\/files\/2019\/01\/Cladecni.png\" alt=\"\" width=\"744\" height=\"483\" srcset=\"https:\/\/blogs.ubc.ca\/mrpletsch\/files\/2019\/01\/Cladecni.png 744w, https:\/\/blogs.ubc.ca\/mrpletsch\/files\/2019\/01\/Cladecni-300x195.png 300w, https:\/\/blogs.ubc.ca\/mrpletsch\/files\/2019\/01\/Cladecni-552x358.png 552w\" sizes=\"auto, (max-width: 744px) 100vw, 744px\" \/><b>Cnid<\/b><b>ar<\/b><b>ia<\/b><b> -&gt; \u201c<\/b><b>Nettle<\/b><b>\u201d \u201c<\/b><b>Bearing<\/b><b>\u201d <\/b><\/li>\n<li><b>Appearing ~580 million years ago<\/b> (<i>Although new genetic evidence suggests cnidarians are older)<\/i><\/li>\n<\/ul>\n<ul>\n<li><b>Most have life cycles that include two stages:<\/b><\/li>\n<\/ul>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul>\n<li><b>1. \u201c<\/b><b>Sessile<\/b><b>\u201d polyp (<\/b><b><i>non-motile &#8211; stuck in one spot)<\/i><\/b><\/li>\n<li><b>2. \u201c<\/b><b>motile<\/b><b>\u201d medusa (<\/b><b><i>Free swimming)<\/i><\/b><\/li>\n<\/ul>\n<\/li>\n<li>Aquatic<\/li>\n<\/ul>\n<figure id=\"attachment_717\" aria-describedby=\"caption-attachment-717\" style=\"width: 845px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-717\" src=\"https:\/\/blogs.ubc.ca\/mrpletsch\/files\/2019\/01\/Screen-Shot-2019-01-23-at-5.23.48-PM.png\" alt=\"\" width=\"845\" height=\"483\" srcset=\"https:\/\/blogs.ubc.ca\/mrpletsch\/files\/2019\/01\/Screen-Shot-2019-01-23-at-5.23.48-PM.png 845w, https:\/\/blogs.ubc.ca\/mrpletsch\/files\/2019\/01\/Screen-Shot-2019-01-23-at-5.23.48-PM-300x171.png 300w, https:\/\/blogs.ubc.ca\/mrpletsch\/files\/2019\/01\/Screen-Shot-2019-01-23-at-5.23.48-PM-768x439.png 768w, https:\/\/blogs.ubc.ca\/mrpletsch\/files\/2019\/01\/Screen-Shot-2019-01-23-at-5.23.48-PM-552x316.png 552w\" sizes=\"auto, (max-width: 845px) 100vw, 845px\" \/><figcaption id=\"caption-attachment-717\" class=\"wp-caption-text\">Figure 1: Diversity of Cnidarians<\/figcaption><\/figure>\n<h3>A. Evolution of Body Plan<\/h3>\n<ol>\n<li><b> Cnidarians have two body plans:<\/b><\/li>\n<\/ol>\n<ul>\n<li><b>Polyp<\/b><b>: A sessile form with mouth and tentacles facing upward.<\/b> <i>Ex. corals, sea anemone)<\/i><\/li>\n<li><b>Medusa:<\/b><b> Free-floating (planktonic) form. Looks like a bell with tentacles and mouth facing downward. <\/b><b>(<\/b><i>Jellies)<\/i><\/li>\n<\/ul>\n<p>2. <b>Body has two cell layers (<\/b><b>ectoderm<\/b> and <b>endoderm<\/b>) separated by a layer of jelly-like \u201c<b>mesoglea<\/b>\u201d<\/p>\n<p><i>This is considered a<\/i><i> primitive <\/i><b><i>tissue<\/i><\/b><i>. <\/i><b><i>Ecto<\/i><\/b><i>derm -&gt; <\/i><b><i>Outer <\/i><\/b><i>skin. <\/i><b><i>Endo<\/i><\/b><i>derm -&gt; <\/i><b><i>Inside<\/i><\/b><i> skin.<\/i><\/p>\n<figure id=\"attachment_719\" aria-describedby=\"caption-attachment-719\" style=\"width: 499px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-719\" src=\"https:\/\/blogs.ubc.ca\/mrpletsch\/files\/2019\/01\/Screen-Shot-2019-01-23-at-5.28.36-PM.png\" alt=\"\" width=\"499\" height=\"274\" srcset=\"https:\/\/blogs.ubc.ca\/mrpletsch\/files\/2019\/01\/Screen-Shot-2019-01-23-at-5.28.36-PM.png 499w, https:\/\/blogs.ubc.ca\/mrpletsch\/files\/2019\/01\/Screen-Shot-2019-01-23-at-5.28.36-PM-300x165.png 300w\" sizes=\"auto, (max-width: 499px) 100vw, 499px\" \/><figcaption id=\"caption-attachment-719\" class=\"wp-caption-text\">Figure 3: Comparison of Body Plan<\/figcaption><\/figure>\n<ol start=\"3\">\n<li><b> <\/b><b>Radial Symmetry <\/b><b>&#8211; <\/b><i>Symmetry around a central axis.<\/i><\/li>\n<\/ol>\n<figure id=\"attachment_720\" aria-describedby=\"caption-attachment-720\" style=\"width: 766px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-720\" src=\"https:\/\/blogs.ubc.ca\/mrpletsch\/files\/2019\/01\/Screen-Shot-2019-01-23-at-5.29.33-PM.png\" alt=\"\" width=\"766\" height=\"288\" srcset=\"https:\/\/blogs.ubc.ca\/mrpletsch\/files\/2019\/01\/Screen-Shot-2019-01-23-at-5.29.33-PM.png 766w, https:\/\/blogs.ubc.ca\/mrpletsch\/files\/2019\/01\/Screen-Shot-2019-01-23-at-5.29.33-PM-300x113.png 300w, https:\/\/blogs.ubc.ca\/mrpletsch\/files\/2019\/01\/Screen-Shot-2019-01-23-at-5.29.33-PM-552x208.png 552w\" sizes=\"auto, (max-width: 766px) 100vw, 766px\" \/><figcaption id=\"caption-attachment-720\" class=\"wp-caption-text\">Figure 4: Radial Symmetry<\/figcaption><\/figure>\n<h3>B. Feeding and Excretion<\/h3>\n<p><iframe loading=\"lazy\" title=\"The deadly tentacles of the Portuguese man o&#039; war | Blue Planet II - BBC One\" width=\"700\" height=\"394\" src=\"https:\/\/www.youtube.com\/embed\/gr1ps0ooDhU?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen><\/iframe><\/p>\n<p>&nbsp;<\/p>\n<ul>\n<li><b>Carnivores that depend on prey coming into contact with their stinging tentacles.<\/b><\/li>\n<li>Tentacles surround the mouth &#8211; which leads to a <b>gastrovascular cavity<\/b> for digestion.<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<ul>\n<li><b>Two-way digestive system &#8211; <i>This means food and waste enter\/exit from the same opening<\/i><\/b><\/li>\n<\/ul>\n<figure id=\"attachment_721\" aria-describedby=\"caption-attachment-721\" style=\"width: 215px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-721\" src=\"https:\/\/blogs.ubc.ca\/mrpletsch\/files\/2019\/01\/Screen-Shot-2019-01-23-at-5.31.20-PM.png\" alt=\"\" width=\"215\" height=\"292\" \/><figcaption id=\"caption-attachment-721\" class=\"wp-caption-text\">Figure 5: A hydra&#8217;s two-way digestive system<\/figcaption><\/figure>\n<h5>How do tentacles catch prey?<\/h5>\n<p>&nbsp;<\/p>\n<ul>\n<li><b>Tentacles are covered with special cells called cnidocytes<\/b><\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul>\n<li>Inside each <b>cnidocyte<\/b> there is a spring-loaded spear called a <b>nematocyst<\/b><\/li>\n<li>The group gets its name for these <b>stinging cells<\/b>! <i>It is the most important defining feature.<\/i><\/li>\n<\/ul>\n<figure id=\"attachment_722\" aria-describedby=\"caption-attachment-722\" style=\"width: 285px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-722\" src=\"https:\/\/blogs.ubc.ca\/mrpletsch\/files\/2019\/01\/Screen-Shot-2019-01-23-at-5.32.26-PM.png\" alt=\"\" width=\"285\" height=\"269\" \/><figcaption id=\"caption-attachment-722\" class=\"wp-caption-text\">Figure 6: Cnidocyte vs. Nematocyst<\/figcaption><\/figure>\n<p><i>Process:<\/i><\/p>\n<ol>\n<li>The tentacle comes into contact with the prey.<\/li>\n<li>Physical and chemical cues cause the nematocyst to shoot out and stick into the prey &#8211; delivering the venom and causing prey to be stuck<\/li>\n<li>Tentacles contract, bringing the prey to the mouth<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<figure id=\"attachment_723\" aria-describedby=\"caption-attachment-723\" style=\"width: 353px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-723\" src=\"https:\/\/blogs.ubc.ca\/mrpletsch\/files\/2019\/01\/Screen-Shot-2019-01-23-at-5.33.32-PM.png\" alt=\"\" width=\"353\" height=\"257\" srcset=\"https:\/\/blogs.ubc.ca\/mrpletsch\/files\/2019\/01\/Screen-Shot-2019-01-23-at-5.33.32-PM.png 353w, https:\/\/blogs.ubc.ca\/mrpletsch\/files\/2019\/01\/Screen-Shot-2019-01-23-at-5.33.32-PM-300x218.png 300w\" sizes=\"auto, (max-width: 353px) 100vw, 353px\" \/><figcaption id=\"caption-attachment-723\" class=\"wp-caption-text\">Figure 7: Process of cnidocyte action<\/figcaption><\/figure>\n<p><iframe loading=\"lazy\" title=\"Jellyfish Stinging in MICROSCOPIC SLOW MOTION - Smarter Every Day 120\" width=\"700\" height=\"394\" src=\"https:\/\/www.youtube.com\/embed\/7WJCnC5ebf4?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen><\/iframe><\/p>\n<p><iframe loading=\"lazy\" title=\"How does a jellyfish sting? - Neosha S Kashef\" width=\"700\" height=\"394\" src=\"https:\/\/www.youtube.com\/embed\/Pu_ijC8HFRU?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen><\/iframe><\/p>\n<h3>C. Respiration and Circulation<\/h3>\n<ul>\n<li>Just like sponges, <b>no organs\/systems to perform these functions.<\/b><\/li>\n<li>Gas exchange occurs through <b>diffusion<\/b> <i>(O2 in, CO2 out). <\/i>Based on concentration outside\/inside the cells &#8211; movement from higher concentration to lower concentration.<\/li>\n<\/ul>\n<h3>D. Reproduction<\/h3>\n<p><b>Both sexual and Asexual reproduction!<\/b><\/p>\n<p><strong>Sexual Reproduction<\/strong><\/p>\n<ul>\n<li>Sexual reproduction: <b>External fertilization.<\/b> Males and females \u201cbroadcast\u201d their gametes (sex cells) into the ocean. <b>Eggs and sperm meet and develop into a planula (larvae).<\/b><\/li>\n<li>These <b>planktonic planula<\/b> will attach to a surface and develop into a <b>polyp <\/b>or stay as a free-floating <b>medusa<\/b>.<\/li>\n<\/ul>\n<p><b>Asexual reproduction<\/b><\/p>\n<p>1. Asexual reproduction through <b>budding<\/b>.<\/p>\n<figure id=\"attachment_724\" aria-describedby=\"caption-attachment-724\" style=\"width: 556px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-724\" src=\"https:\/\/blogs.ubc.ca\/mrpletsch\/files\/2019\/01\/Screen-Shot-2019-01-23-at-5.36.34-PM.png\" alt=\"\" width=\"556\" height=\"195\" srcset=\"https:\/\/blogs.ubc.ca\/mrpletsch\/files\/2019\/01\/Screen-Shot-2019-01-23-at-5.36.34-PM.png 556w, https:\/\/blogs.ubc.ca\/mrpletsch\/files\/2019\/01\/Screen-Shot-2019-01-23-at-5.36.34-PM-300x105.png 300w, https:\/\/blogs.ubc.ca\/mrpletsch\/files\/2019\/01\/Screen-Shot-2019-01-23-at-5.36.34-PM-552x194.png 552w\" sizes=\"auto, (max-width: 556px) 100vw, 556px\" \/><figcaption id=\"caption-attachment-724\" class=\"wp-caption-text\">Figure 8: Budding in Hydra<\/figcaption><\/figure>\n<p>2. <b>Strobilation<\/b><\/p>\n<ul>\n<li><b>A polyp grows a stack of medusa clones which swim away (<\/b><b><i>Jellies)<\/i><\/b><\/li>\n<\/ul>\n<figure id=\"attachment_725\" aria-describedby=\"caption-attachment-725\" style=\"width: 303px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-725\" src=\"https:\/\/blogs.ubc.ca\/mrpletsch\/files\/2019\/01\/Screen-Shot-2019-01-23-at-5.37.33-PM.png\" alt=\"\" width=\"303\" height=\"277\" srcset=\"https:\/\/blogs.ubc.ca\/mrpletsch\/files\/2019\/01\/Screen-Shot-2019-01-23-at-5.37.33-PM.png 303w, https:\/\/blogs.ubc.ca\/mrpletsch\/files\/2019\/01\/Screen-Shot-2019-01-23-at-5.37.33-PM-300x274.png 300w\" sizes=\"auto, (max-width: 303px) 100vw, 303px\" \/><figcaption id=\"caption-attachment-725\" class=\"wp-caption-text\">Figure 9: Life cycle with stobilation<\/figcaption><\/figure>\n<p>Note:<\/p>\n<p><i>Most cnidarians cycle between <\/i><b><i>medusa <\/i><\/b><i>and <\/i><b><i>polyp <\/i><\/b><i>body plans.<\/i><\/p>\n<p><b><i>Polyps<\/i><\/b><i> typically reproduce asexually. Strobilation leads to free swimming <\/i><b><i>medusa<\/i><\/b><i>.<\/i><\/p>\n<p><b><i>Medusa sexually reproduce. Planula develop and attach to a surface (Polyp)<\/i><\/b><\/p>\n<figure id=\"attachment_726\" aria-describedby=\"caption-attachment-726\" style=\"width: 643px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-726\" src=\"https:\/\/blogs.ubc.ca\/mrpletsch\/files\/2019\/01\/Screen-Shot-2019-01-23-at-5.38.37-PM.png\" alt=\"\" width=\"643\" height=\"362\" srcset=\"https:\/\/blogs.ubc.ca\/mrpletsch\/files\/2019\/01\/Screen-Shot-2019-01-23-at-5.38.37-PM.png 643w, https:\/\/blogs.ubc.ca\/mrpletsch\/files\/2019\/01\/Screen-Shot-2019-01-23-at-5.38.37-PM-300x169.png 300w, https:\/\/blogs.ubc.ca\/mrpletsch\/files\/2019\/01\/Screen-Shot-2019-01-23-at-5.38.37-PM-552x311.png 552w\" sizes=\"auto, (max-width: 643px) 100vw, 643px\" \/><figcaption id=\"caption-attachment-726\" class=\"wp-caption-text\">Figure 10: Typical cnidarian lifecycle &#8211; sexual\/asexual reproduction with medusa and polyp form<\/figcaption><\/figure>\n<h3>E. Major Groups<\/h3>\n<figure id=\"attachment_727\" aria-describedby=\"caption-attachment-727\" style=\"width: 666px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-727\" src=\"https:\/\/blogs.ubc.ca\/mrpletsch\/files\/2019\/01\/Screen-Shot-2019-01-23-at-5.39.41-PM.png\" alt=\"\" width=\"666\" height=\"319\" srcset=\"https:\/\/blogs.ubc.ca\/mrpletsch\/files\/2019\/01\/Screen-Shot-2019-01-23-at-5.39.41-PM.png 666w, https:\/\/blogs.ubc.ca\/mrpletsch\/files\/2019\/01\/Screen-Shot-2019-01-23-at-5.39.41-PM-300x144.png 300w, https:\/\/blogs.ubc.ca\/mrpletsch\/files\/2019\/01\/Screen-Shot-2019-01-23-at-5.39.41-PM-552x264.png 552w\" sizes=\"auto, (max-width: 666px) 100vw, 666px\" \/><figcaption id=\"caption-attachment-727\" class=\"wp-caption-text\">Figure 11: Major Classes of Cnidarians<\/figcaption><\/figure>\n<p><b>Class Cubozoa (Box Jellies)<\/b><\/p>\n<ul>\n<li>Active\/deadly hunters &#8211; usually powerful venom that can kill humans.<\/li>\n<li>Have a special flap called a \u201cvellum\u201d which helps them swim quickly.<\/li>\n<li>Box shaped<\/li>\n<li>Have specialized \u201ceyes\u201d that help them hunt<\/li>\n<\/ul>\n<p><iframe loading=\"lazy\" title=\"The World&#039;s Most Deadly Venom  The Box Jellyfish\" width=\"700\" height=\"394\" src=\"https:\/\/www.youtube.com\/embed\/7OZhnXCtuGY?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen><\/iframe><\/p>\n<p><b>Class Scyphozoa<\/b> (True Jellies)<\/p>\n<ul>\n<li>Solitary (not colonial)<\/li>\n<li>Free swimming medusa form with reduced or absent polyp stage<\/li>\n<li>Sexualy reproduction commong in medusa.<\/li>\n<\/ul>\n<p><b>Class Anthozoa <\/b>(Anemones and Coral)<\/p>\n<ul>\n<li>Solitary or colonial<\/li>\n<li>Adults are <b>sessile<\/b> (non-motile)<\/li>\n<li>Only polyp phase, no medusa.<\/li>\n<li>Polyp performs sexual reproduction<\/li>\n<\/ul>\n<p><strong>Class Hydrozoa<\/strong> (Hydra\/Portuguese Man o&#8217; War)<\/p>\n<ul>\n<li>Use your pre-lab:)<\/li>\n<\/ul>\n<h3>Extra: Jellyfish as food<\/h3>\n<ul>\n<li>As we release more CO2, our ocean becomes more acidic.<\/li>\n<li>Animals (such as molluscs) struggle in this environment and are in trouble.<\/li>\n<li>Jellyfish will rule the seas!<\/li>\n<li>Jellyfish numbers are increasing in many places!<\/li>\n<\/ul>\n<figure id=\"attachment_728\" aria-describedby=\"caption-attachment-728\" style=\"width: 513px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-728\" src=\"https:\/\/blogs.ubc.ca\/mrpletsch\/files\/2019\/01\/Screen-Shot-2019-01-23-at-5.41.57-PM.png\" alt=\"\" width=\"513\" height=\"486\" srcset=\"https:\/\/blogs.ubc.ca\/mrpletsch\/files\/2019\/01\/Screen-Shot-2019-01-23-at-5.41.57-PM.png 513w, https:\/\/blogs.ubc.ca\/mrpletsch\/files\/2019\/01\/Screen-Shot-2019-01-23-at-5.41.57-PM-300x284.png 300w\" sizes=\"auto, (max-width: 513px) 100vw, 513px\" \/><figcaption id=\"caption-attachment-728\" class=\"wp-caption-text\">Figure 12: Ocean acidificaiton &#8211; future problems<\/figcaption><\/figure>\n<blockquote class=\"wp-embedded-content\" data-secret=\"yPXKJbDBcZ\"><p><a href=\"https:\/\/oceans.ubc.ca\/2017\/02\/28\/jellyfish-abound-and-may-be-coming-to-a-dinner-plate-near-you\/\">Jellyfish abound, and may be coming to a dinner plate near you<\/a><\/p><\/blockquote>\n<p><iframe loading=\"lazy\" title=\"&#8220;Jellyfish abound, and may be coming to a dinner plate near you&#8221; &#8212; Institute for the Oceans and Fisheries\" class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; clip: rect(1px, 1px, 1px, 1px);\" src=\"https:\/\/oceans.ubc.ca\/2017\/02\/28\/jellyfish-abound-and-may-be-coming-to-a-dinner-plate-near-you\/embed\/#?secret=yPXKJbDBcZ\" data-secret=\"yPXKJbDBcZ\" width=\"600\" height=\"338\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe><\/p>\n<p><b>Jellyfish Salad &#8211; Basics (Ask for the full recipe or check out some others!) I bought the jellyfish we ate at T&amp;T Marine Drive \ud83d\ude42<br \/>\n<\/b><\/p>\n<ol>\n<li>Get a group of about 5 &#8211; collect a mixing bowl, small bowl, cutting board, and scissors.<\/li>\n<li>Follow the recipe: <b><i>below is a fast breakdown.<\/i><\/b><\/li>\n<li>Cut jellyfish into strips &#8211; pour boiling water then cold water over.<\/li>\n<li>Mix up sauce.<\/li>\n<li>Add veggies to jellyfish.<\/li>\n<li>Put on sauce (or whatever &#8211; just chili sauce? OK! Just soy sauce? Go for it!)<\/li>\n<li>Save the oceans and eat the mesoglea!<\/li>\n<\/ol>\n<h3>Additional Review Questions<\/h3>\n<ol>\n<li>What is the <b>defining feature<\/b> of cnidarians? (<i>Hint: Think about their name and the type of cell they use to hunt)<\/i><\/li>\n<li><i> <\/i>Draw and label a diagram of the <b>typical<\/b> life cycle of a cnidarian. Include a <b>medusa<\/b> and a <b>polyp phase<\/b>. <i>(Include the terms: strobilation, external fertilization, planula, medusa, and polyp)<\/i><\/li>\n<li>How many <b>cell layers<\/b> do cnidarians have? What are these called? What is in between them?<\/li>\n<li>Describe a <b>two-way <\/b>digestive system found in cnidarians.<\/li>\n<li>Compare <b>sponges <\/b>to <b>cnidarians<\/b>. What do they have in common? What differences?<\/li>\n<li>Describe the complete feeding process in <strong>cnidarians<\/strong> (from catching to eating to getting rid of waste). Be sure to include as much detail as you can including the cells involved and their mechanism.<\/li>\n<\/ol>\n<p><a href=\"https:\/\/quizlet.com\/_5zsrdv\">Quizlet: Term study set!<\/a><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p class=\"post-excerpt\">Phylum Cnidaria &#8211; Basics Cnidaria -&gt; \u201cNettle\u201d \u201cBearing\u201d Appearing ~580 million years ago (Although new genetic evidence suggests cnidarians are&#8230;<\/p>\n","protected":false},"author":48401,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1200970],"tags":[],"class_list":["post-715","post","type-post","status-publish","format-standard","hentry","category-biology-11"],"_links":{"self":[{"href":"https:\/\/blogs.ubc.ca\/mrpletsch\/wp-json\/wp\/v2\/posts\/715","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blogs.ubc.ca\/mrpletsch\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blogs.ubc.ca\/mrpletsch\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.ubc.ca\/mrpletsch\/wp-json\/wp\/v2\/users\/48401"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.ubc.ca\/mrpletsch\/wp-json\/wp\/v2\/comments?post=715"}],"version-history":[{"count":3,"href":"https:\/\/blogs.ubc.ca\/mrpletsch\/wp-json\/wp\/v2\/posts\/715\/revisions"}],"predecessor-version":[{"id":1384,"href":"https:\/\/blogs.ubc.ca\/mrpletsch\/wp-json\/wp\/v2\/posts\/715\/revisions\/1384"}],"wp:attachment":[{"href":"https:\/\/blogs.ubc.ca\/mrpletsch\/wp-json\/wp\/v2\/media?parent=715"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.ubc.ca\/mrpletsch\/wp-json\/wp\/v2\/categories?post=715"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.ubc.ca\/mrpletsch\/wp-json\/wp\/v2\/tags?post=715"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}