What is the probable sequence in which the following

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16) What is the probable sequence in which the following clades of animals originated, from earliest to most recent? 1. tetrapods 2. vertebrates 3. deuterostomes 4. amniotes 5. bilaterians A) 5 3 2 4 1 B) 5 3 2 1 4 C) 5 3 4 2 1 D) 3 5 4 2 1 E) 3 5 2 1 4 Answer: B Topic: Concept 32.2 Skill: Knowledge/Comprehension 17) Sponges and cnidarians are among the fossilized animals found in both the Ediacara Hills and the Burgess Shale from the Rocky Mountains of British Colombia. This observation requires that 18) Arthropods invaded land about 100 million years before vertebrates did so. This most clearly implies that 19) An adult animal that possesses bilateral symmetry is most certainly also 5
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20) An obsolete taxon, the "Radiata," included all phyla whose adults had true radial symmetry. Today, the "Radiata" is more correctly considered to be 1. a clade. 2. a grade. 3. monophyletic. 4. paraphyletic. 5. polyphyletic. A) 1 and 2 B) 1 and 3 C) 2 and 4 D) 2 and 5 E) 1, 2, and 3 Answer: C Topic: Concept 32.3 Skill: Application/Analysis 21) Soon after the coelom begins to form, a researcher injects a dye into the coelom of a deuterostome embryo. Initially, the dye should be able to flow directly into the
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