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Animals

33

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Biology
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Developmental biology
Platyhelminthes
Triploblasty
Gastrovascular cavity
Flatworm
Eumetazoa
Cnidaria
Invertebrate
Sponge
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An Introduction to Invertebrates Chapter 33 Porifera (Sponges) Parazoa (no true tissue) Sedentary (Sessile) Suspension Feeders Choanocytes (Collar Cells) Cnidarians (Hydras, Corals, Jellies) Eumetazoans (True Tissue) Diploblastic Radial Body Plan Gastrovascular cavity Single opening serves as anus and mouth Lophotrochozoans Eumetazoans Bilateral Symmetry Triploblastic Lophotrochozoans Platyhelminthes (Flatworms) Triploblastic acoelomates Ex. Planarians Platyhelminthes (Flatworms) Trematodes (parasitic flukes) Platyhelminthes (Flatworms) Tapeworms (parasitic flatworm) Scolex proglottids Lophotrochozoans Rotifers Alimentary canal Pseudocoelomates parthenogenesis Lophotrochozoans Lophophorates Have crown of ciliated tentacles around mouth Coelomates

morphology

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morphology


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Emily Hebel September 11, 2011 Critical Reading #1 Task 1 A negative control in your experiment shows the experimenter that your experiment actually works in the way that it should, when you neglect the experimental variable. It makes sure there is no effect when there should be no effect. A negative control also rules out any alternative explanations. A negative control addresses the concerns that there could be something else causing the reaction.
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