1. Horseshoe crabs A are, like their relatives t B are poisonous to humans. C. l
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1. Horseshoe crabs A are, like their relatives t B are poisonous to humans. C. live in freshwater habitats he trilobites andeurypterids, now extinct. D,) have a long, spine-like telson. are adult forms of trilobites 2. An animal with a simple net-like nervous system is the A. earthworm. B. dog Cenidarian hydra. D. molluscan octopus. E. flatworm. 3. How do spiders eat? A A spider mashes and manipulates food with its fangs so it can be swallowed whole. 8. Food is soaked into silk threads which are thenconsumed. Food is partly digested externally and the nutritive juices are sucked into the stomach. D: Food is stored in a cropand ground up in a gizzard. Food is swallowed whole 4. Animals with three well-defined germ layers and that have one solid mass of tissue rather than tissues and organs nesti inside a body cavity are B. eucoelomate and diploblastic. C. pseudocoelomate and triploblastic. D. quasicoelomate and diploblastic. E. coelomate and triploblastic. 5. Which one of the following statements regarding the origin of metazoans has the most support? A. The choanoflagellates share features with the sponges, like having collars of microvilli surrounding a flagellum and b colonial. These shared features suggest a link to at least one metazoan lineage. B. Metazoans are derived from many separate lineages of unicellular organisms. C. Ancient metazoans, similar to members of the phylum Pl D. Modern sponges have a genetic makeup that reflects their ancestral status acozoa, have been ruled out as ancestral metazoans. 6. Polychaetes differ from other annelids because polychaetes A lack any head or specialized sense organs. have paired parapodia on most segments C. have a clitellum used for reproductive purposes. D. lack setae. E All of the choices are correct. 7. Nematocysts are widespread among the animal kingdom but first developed by Chidaria. ormed and used only by Cnidaria although a few other organisms may "steal" them. C. first found in sponges, most highly developed in cnidarians, but still found as remnants in some higher groups. D, E. None of the choices are correct actually free-living symbionts that are most usually taken up by cnidarians, as are many green algae.Explanation / Answer
1) Horse shoe crab has long spine like telson which is used to turn over.
2)Hydra has the simple net like nervous system.
3)The spider injects the insect with a poison using its fangs.The poison digest the inside of the prey by turning it watery. Thus the correct option is (c).
4) Acoelomate and triplobastic animals have well defined three well defined germ layers and one solid mass of tissue.
6) Polychaetes differ from other annelides because polychaetes have paired parapodia in most of the segments.
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