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

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The concept of the struggle for existence concerns the competition or battle for resources needed to live. It can refer to human society, or to organisms in nature.

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Vestigial organs are organs of the body which are smaller and simpler than those in related species.

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is an example of an organ or bone that appears in different animals, underlining anatomical commonalities demonstrating descent from a common ancestor.

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describes how, in evolutionary biology, a group of organisms share a most recent common ancestor.

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is simply passing traits from parent to offspring, and this concept is one of the fundamental ideas behind Charles Darwin's theory of evolution.

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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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is the intentional reproduction of individuals in a population that have desirable traits.