What are possible reasons for the rapid change in gene regulation?

list the 4 parts of the earths structure.

What is the Lithosphere?

What is the hydrosphere?

What is the atmosphere?

what is the troposphere?

What is the Stratosphere?

What is the Biosphere?

How was the earth structured 800 millions years ago?

What caused the rapid change in diversity of organisms?

What are the 4 eras of earth's evolution, listed in order? How long were they?

The Phanerozoic is divided into three eras. What are they? How long did they last?

Describe the Ordovician period of the Paleozoic era. (2 major species)

Why did the extinction of a species result in more biological diversity?

What percent of species that have existed on the plant, do we believe have died out?

Describe the Silurian Period in Paleozoic era (3 major organism types)

Describe the Devonian period in the Paleozoic era. (3 main species types)

Describe the carboniferous period in the Paleozoic era. (2 species and 1 event)