Geological Time

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In early Paleozoic era, life was restricted to the

What principle states that physical, biological and chemical processes we observe today have also operated in the geologic past

What improtant event in animal evolution marks the beginning of the Cambrian eon

Fossils rarely preserve the _________ parts of animals because scavengers often eat them and bacteria decompose them

What animals dominated the Mesozoic era

How are mammals distinct from reptiles

What event may have triggered the great Paleozoic extinctions?

One group of reptiles, characterized by the fossil Archaipteryx, led to the evolution of __________.