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Unit 3 Vocabulary

Across
the remains of an organism that lived long ago
when humans breed organisms that have certain desired traits
Change over time
a species that has died out completely
historical sequence of life indicated by fossils found in layers of Earth's crust
Down
the process by which individuals that are better adapted to their environment survive and reproduce
characteristic that allows an organism to survive in its environment
differences among organisms
group of organisms that are closely related and can mate to produce fertile offspring
a genetically determined characteristic