Which are two ways a population can decrease in size?

On the Galápagos Islands, Charles Darwin observed

Darwin viewed the fossil record as

If an allele makes up one fourth of a population’s alleles for a given trait, its relative frequency is

The two main sources of genetic variation are

Natural selection acts directly on

The separation of populations by barriers such as rivers, mountains, or bodies of water is called ____________ isolation.

Examples of fossils include preserved

What is the basic unit (cell) of the nervous system?

The process by which organ systems maintain a relatively constant internal environment is called

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