Interactions among Living Things

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Natural Selection

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The process by which organisms that are better adapted to their environment survive and reproduce, passing on their traits to the next generation.

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Parasite

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An organism that lives on or in a host and causes harm to the host.

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Niche

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An organism's particular role in its habitat, including how it obtains its resources and interacts with other organisms.

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Adaptation

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A characteristic that improves an organism's ability to survive and reproduce in its environment.

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Predator

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An organism that hunts and eats other organisms.

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Prey

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An organism that is hunted and eaten by predators.

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Symbiosis

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A close and long-term interaction between two different species, which can be beneficial, harmful, or neutral.

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Competition

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The struggle between organisms for the same resources in an ecosystem.

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Ecosystem

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A community of living organisms and their physical environment interacting as a system.

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Carrying Capacity

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The maximum number of individuals of a particular species that an environment can support sustainably.