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Organisms with traits well suited to their environment survive
and reproduce at a greater rate than less well-adapted organisms
in the same environment.

Example: The strong will succeed and the weak shall perish. Strength does not always mean physical might.

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The process whereby organisms better adapted to their environment tend to survive and produce more offspring. The theory of its action was first fully expounded by Charles Darwin and is now believed to be the main process that brings about evolution.

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A change or the process of change by which an organism or species becomes better suited to its environment.

Example: Polar bears adapted to life in the cold after evolving from brown bears.

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Charles Darwin (1809-1882) was a naturalist and scientist best known for developing the theory of evolution to explain biological change.

He formulated the theory of natural selection.

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Genes are sections of DNA and carry hereditary information passed from parents to children.

Ex: Genes contain the blueprint for each individual's specific traits.

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The ship that Charles Darwin embarked on for a five-year survey voyage around the world.

His study of specimens led him to formulate his theories.

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The theory of evolution is based on the idea that all species are related and gradually change over time.

Example: According to fossil record, modern horses are said to have evolved from a forest dwelling horse the size of a dog.

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Sexual reproduction provides genetic diversity because the sperm and egg that are produced contain different combinations of genes than the parent organisms

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An individual with characteristics different from the others of the same kind

Example: In humans, genetic variation causes different hair, eye, and skin color.