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the action or process of adapting or being adapted.

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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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are organs of the body which are smaller and simpler than those in related species. They have lost, or almost lost their original function. Vestigiality is evidence for evolution, since they only make sense if evolution has occurred

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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. In other words, it's when very different animals have bones that appear very similar in form or function and seem to be related.

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describes how, in evolutionary biology, a group of organisms share a most recent common ancestor. There is "massive" evidence of common descent of all life on Earth from the last universal common ancestor (LUCA).

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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. ... You pass traits on to your children in a process known as heredity.

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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. In organisms that reproduce sexually, two adults that possess a desired trait — such as two parent plants that are tall — are bred together.