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biology 202

6 Most Cnidarians A) exist only as medusa in their life cycle. B) exist only as polyps in their life cycle c) encyst when they encounter adverse environmental conditions D) alternate between a polyp and a medusa during their life cycle E) none of the above. 7) Which of the following statements about deuterostomes is true? A) Deuterostomes lack true tissues. B) Deuterostomes have only two layers. C) The opening that forms during deuterostome gastrulation becomes the anus D) The opening that forms during deuterostomes gastrulation becomes the mouth. E) Deuterostomes always lack a body cavity 8). How do sponges transport nutrients within their bodies? They have simple digestive and circulatory systems composed of sponging channels. B) A) They rely on diffusion to move nutrients between their cells. C) Their mobile amoebocytes transport food molecules from cell to cell. D) They are not able to transport nutrients. They are autotrophs, so each cell absorbs its own nutrients and produces its own food E) They are not able to transport nutrients within their bodies, but must independently absorb all necessary nutrients from the surrounding water 9) The traits that are unique to insects and have probably contributed to their diversity and success include: A) Small body size, an exoskeleton, and sexual reproduction 8) Flight, short generation times, and complex life cycles including complete metamorphosis. C) The exoskeleton, an open circulatory system, and jointed appendages. D) A closed circulatory system, long adult life spans, and an elaborate central nervous system. E) The presence of four or more pairs lof legs, an exoskeleton, and a water resistant cuticle. 10. To be Characterized as a chordate, an organism must A) Display all four key characteristics of chordates in both the larval and adult stages 8) Possess a backbone in both the larval and adult stages. C) Possess a backbone in at least one life stage. D) Display each of the four characteristics of the chordates at some point in the life cycle E) Undergo incomplete metamorphosis
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