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BIO 100 Exam 3 2025 Questions and Answers Sponge - ....ANSWER ...-I am a simple, asymmetrical animal that is almost entirely marine Cnidarian - ....ANSWER ...-I have both polyp and medusa body forms Flatworm - ....ANSWER ...-I'm a trematode parasite Annelida - ....ANSWER ...-Chitinous hairlike extensions, anchored in the skin and projecting from the cuticle, called chaetae, are present in every segment in most of my groups Echinoderm - ....ANSWER Chordate - ....ANSWER Arthropoda - ....ANSWER ...-I have a water vascular system and tube feet ...-I have a notochord ...-the phylum to which jointed-legged invertebrates belong, including insects, arachnids and crustaceans Nematode - ....ANSWER ...-Round worms. The first animals to have a full digestive tract (2 openings). Mollusca - ....ANSWER ...-(snails, clams, squids, octopuses) have a soft body that in many species is protected by a hard shell …FOR STUDENTS ONLY…©️2025 ALL RIGHTS RESERVED… 1