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Chapter 7

Across
The trace or remains of an organism that lived long ago
The period between the birth of one generation and the birth of the next generation
The human practice of breeding animals or plants that have certain desired traits
The process in which inherited characteristics within a population change over generations such that new species sometimes arise
A characteristic that improves an individual's ability to survive and reproduce in a particular environment
Down
A historical sequence of life indicated by fossils found in layers of earths crust
The formation of new species as a result of evolution
A group of organisms that are closely related and can mate to produce fertile offspring
The process by which individuals that are better adapted for their environment survive and reproduce more successfully than others
A genetically determined characteristic