Describe the characteristics of an excellent guide fossil and provide one example.
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Q38: _ were large amphibians abundant during the
Q39: Corals became dominant reef-builders in the _.
A)Cambrian
B)Ordovician
C)Silurian
D)Carboniferous
E)Permian
Q40: Limbs probably initially evolved to _.
A)walk on
Q41: _ were warm-blooded, so they were able
Q42: Organisms that live on the seafloor are
Q44: What was the evolutionary advantage of having
Q45: The oldest fossils of the first vascular
Q46: Seedless vascular plants evolved which of the
Q47: What selective advantages did an exoskeleton or
Q48: The development of _ increased the diversity
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