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1) stasis • A) is an essential part of the gradualist model of evolution • B) refers to morphological stasis, not molecular stasis • C) suggests strong directional selection • D) is more likely in dueterostomes • E) none of the above 2) You are: • • • • • A) a deuterostome B) a protostome C) an acoelomate D) radially symmetrical E) none of the above 3) The “age of mammals” • A) is the mesozoic • B) started with an adaptive radiation following the demise of the dinosaurs • C) is the cenozoic • D) is about 300 million years old • E) B and C 4) The phanerozoic • A) is the period of time before the Cambrian explosion • B) consists of the Paleozoic, the Mesozoic, and the Cenozoic • C) was when atmospheric oxygen levels first started to rise • D) resulted from the end-Permian extinction • E) killed the dinosaurs 5) Animal phyla • A) are distinguished by differences in embryonic development and adult body plan • B) were mostly all present by about 535 million years ago • C) probably diverged during or prior to the cambrian explosion • D) all of the above