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Animal Evolution –The Invertebrates

Animal Evolution –The Invertebrates. Chapter 25 Part 3. 25.11 Roundworms— Unsegmented Worms That Molt. Roundworms (phylum Nematoda) are unsegmented, pseudocoelomate worms with a secreted cuticle that is molted Most are decomposers, some are parasites

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ARTHROPODS

ARTHROPODS. Arthropods. (“jointed foot”) ¾ of all animals on planet Earth! 750,000+ species….why so numerous and successful?. 1: Reproduce fast &amp; in large numbers. opportunity for variation is therefore great

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Arthropods and Echinoderms

Arthropods and Echinoderms. Ms. Moore 2/15/13. Introduction to the Arthropods. Phylum: Arthropoda What is an Arthropod? Arthropods have a segmented body, a tough exoskeleton, and jointed appendages

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