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Artificial Selection

This is the process by which plants or animals kept by breeders are gradually improved.

Natural Selection

This is the process by which plants and animals in nature are gradually improved and adapted to their environment.

Geological Record

This is the collection of fossils found in the earth and represent a sample of creatures that have lived in the past, even the distant past.

Geographical Distribution

This refers to where organisms are found to exist on the earth and, according to the author's theory, all organisms of the same species descended from the same ancestor.

Struggle for Existence

This concept is how the author describes the competition among organisms for the scarce resources provided by nature.

Morphology

This is the study of the physical properties of plants and animals.

Embryology

This is the study of embryos of animals.

H.M.S. Beagle

This is the ship...

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