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Evolution

Across
Time needed for half of something radioactive to change.
Study Fossils.
Survival of the fittest.
Long period of time.
Islands in the Pacific.
Darwin's ship.
Small differences in apperance.
Down
No longer living on Earth.
Struggle for existence
Long time ago dead things.
Changes in a species.
Darwin's new idea.
Darwin's Book
Proposed that living things change over time.
Length of Darwin's voyage.
Eras are divided into these.