The average span of time between the birth of parents and that of their offspring is known as a(n)

A trait that makes an individual different from other members of its species

A group of organisms that share similar characteristics and can reproduce among themselves

What is any permanent change in a gene or a chromosome (the DNA) called?

A(n) ________________ is any variation that makes an organism better suited to its environment.

Which of these best illustrates natural selection?

In the phrase survival of the fittest, to what does the term fittest refer?

__________________________ is an adaptation that enables an organism to blend into its environment.

Which word describes the majority of permanent genetic mutations?

Change in inherited traits over time.

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