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impression of an organism in a rock

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remained unchanged for over 150 years.

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estimate at what time in the past living species diverged from common ancestors.

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The genes and proteins.

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comparing genes and proteins among living species.

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Study of gene structure and function.

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All vertebrate embryos have pharyngeal pouches at one stage.
The similarities in function and location of gills and glands suggest a strong evolutionary relationship between fish and other vertebrates.

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The science of the development of embryos from fertilization to birth.

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body parts that have lost their original function through evolution.

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Body parts that perform a similar function but differ in structure.

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Body parts of organisms that are similar in structure and position but differ in function.

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Study of similarities and differences among structures of living species.

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Depends on how closely in time they diverged, or split, from their common ancestor.

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Living species that are closely related.

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Explains and supports Darwin's theory.
Nature selecting variations, humans selected them.

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The breeding of organisms for desired characteristics.

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Include temperature, water, and nutrients in soil, and climate.

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The resemblance of one species to another species.

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involve internal internal body systems that affect biochemistry.

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involve the way an organism behaves or acts.

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The shape of a tortoises neck

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Process by which populations of organism's with variations that help them survive in their environments longer, compete better, and reproduce more than those that do not have the variations.

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Person who studies plants and animals by observing them.