Geological Time

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How are mammals distinct from reptiles

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

In early Paleozoic era, life was restricted to the

What event may have triggered the great Paleozoic extinctions?

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

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

What animals dominated the Mesozoic era

What happened to all the continents by the close of the Paleozoic era