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212MolluscaLE - 2 How does the function of the gills in...

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BIOL 212 Lab Exercise: Mollusca Name_______________________________________ 1. Write the appropriate group of animals from the table below next to the empty nodes on the phylogenetic tree. Write the appropriate morphological change from the table next to the bars on the phylogenetic tree. Hint: Need help? See BioSkills 2 (Appendix B) & Figs. 32.10 & 33.6 in your textbook. Animal groups Morphological changes Annelida, Deuterostomia, Ecdysozoa, Lophotrochozoa, Mollusca cuticle/exoskeleton, coelom, blastopore becomes mouth, reduced coelom, segmentation
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Unformatted text preview: 2. How does the function of the gills in Bivalvia differ from that in Cephalopoda? Why don't the terrestrial slugs and snails (Gastropoda) have gills? What sort of breathing apparatus would you expect to find in Polyplacophora? Hint: See Chapter 33, pp. 725-727. 3. Give the common names for each of the mollusk classes below. Mollusk class Common name(s) Bivalvia Cephalopoda Gastropoda Polyplacophora 4. What is a radula used for? What structure in cephalopods represents a modified radula? Why do bivalves lack a radula?...
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