Trilobites, an organism abundant in the Early Paleozoic and less abundant in the Late Paleozoic, greatly flourished after the Permian extinction.
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Q2: All chordates are vertebrates.
Q9: Animals with rigid skeletons appeared abruptly in
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Q11: The critical factors in species survival of
Q13: Which feeding group ingests sediment and extract
Q15: Sessile organisms _.
A)move about freely
B)move only to
Q16: An organism classified as an autotroph _.
A)is
Q17: The Precambrian-Cambrian boundary represents the first appearance
Q18: One of the most significant roles of
Q19: Fusulinids, greatly diversified in the Pennsylvanian and
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