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

In early Paleozoic era, life was restricted to the

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

What event may have triggered the great Paleozoic extinctions?

What animals dominated the Mesozoic era

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

What likely contributed to the extinction tht marks the end of the Mesozoic Era?

How are mammals distinct from reptiles

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

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

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