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Evolution Crossword

Across
The process in which species better adapt to their environment
The continued existence of organisms best adapted to their environment
Branch of science that involves categorizing; especially organisms
Down
A group of organisms so close to each other that they can produce fertile offspring
A group of organisms from the same species populating a given area
A trace of an organism that lived in the past
Differences in physical traits of an individual from the group it belongs
Established that all species on earth descended from common ancestors