Q64: At the start of the Mesozoic,the climate
Q65: Trilobites brachiopods fish dinosaurs
Q66: An important evolutionary step for reptiles was
Q67: The largest mass extinction in the Phanerozoic
Q68: Human ancestors developed the tendency to walk
Q70: Cambrian Mississippian Jurassic Devonian
Q71: Which of the following is modern descendant
Q72: The first fully land-based animals were _.
A)reptiles
B)amphibians
C)eukaryotes
D)stromatolites
E)cephalopods
Q73: The decay of radioactive atoms,coupled with heat
Q74: What group of animals were the first
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