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the continued existence of organisms that are best adapted to their environment, with the extinction of others, as a concept in the Darwinian theory of evolution.

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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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also called Darwinian fitness, means the ability to survive to reproductive age, find a mate, and produce offspring.

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refers to the competition between living things to survive.

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

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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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Practical teaching and learning materials for IB students and teachers with ready-made units, course guidance, skill-building activities, marked samples & teacher support, by experienced IBDP workshop leaders, textbook authors and examiners.

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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.

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

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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.