The Earth formed over 4,500 million years ago. Bacteria were likely the first life forms, didn't appear until about 3,5000 million years ago. Since that time, a great variety of life has evolved. Most of the plant and animal life that has arisen has subsequently gone extinct and our only ties to them are through the fossil record.
Wednesday, February 11, 2009
EARTH: THE BLUE PLANET
The Earth formed over 4,500 million years ago. Bacteria were likely the first life forms, didn't appear until about 3,5000 million years ago. Since that time, a great variety of life has evolved. Most of the plant and animal life that has arisen has subsequently gone extinct and our only ties to them are through the fossil record.
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