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Science Project

Across
Level of which an individual that is best suited for the environment
Different imprints found in rocks by scientists
Event that changes genetic structure
An imprint of previous life sometimes found in a rock
The strongest survive
Using geographical evidence to determine age of a rock
Another word for changeability
Down
No longer exists
Physical change in a species over a long period of time
Having similarity's genetically to a different species
Gave us the theory of evolution
Physical change in a species over a period of time
Similar living thing that can breed
A change to make something else easier
A unit of heredity