BIOL 112 Lecture Notes - Lecture 1: Gastrovascular Cavity, Flatworm, Symmetry In Biology
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Compare and contrast characteristics of animals in phylum cnidaria and phylum platyhelminthes. In your answer - provide one example of how these animals are the same and one example of how they are different. There are many possible answers here these are some examples. Both have an incomplete gut (gastrovascular cavity) with one opening as mouth and anus both use large surface area with environment for gas exchange (skin/outer layer plus interior of gastrovascular cavity) Both are capable of sexual and asexual reproduction different :cnid. are diploblasts, platy. are triploblasts. Cnid. are radially symmetrical, platy. have bilateral symmetry. Cnid. capture prey with tentacles and nematocysts, platy. do not (or describe how something like a planaria feeds) Cnid. can metamorphose between two body forms (medusa and polyp), platy. do not undergo a metamorphosis 2. Compare and contrast gas exchange in a sponge and a fish.
