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The origins of life on earth

Fossils are the remains of plants or animals from many thousands of years ago and are found in rocks

Fossils provide us with evidence of how much or how little different organisms have changed since life developed on earth.

It is very diffucult for scientists to know exactly how life on earth began because there is no direct evidence.

Forming Fossils

Fossils can be formed in a number of ways.

Many fossils were formed when harder parts of the animal or plant were replaced by other minerals over a long period of time.  These are the most common type of fossils.

Another type of fossil is formed when an animal or plant did not decay after death.  When they didn't decay they could've been preserved in ice.

Theories of Evolution

All species of living things have evolved from simple life forms.  These simple forms developed more than


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