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8.3 Population Ecology

Part of Ecology in AP® Biology. Read the opening section, then create a free account for the full interactive lesson, practice, and progress tracking.

Interaction Between Organisms and Their Environment

Populations consist of individual organisms that interact with each other and with their environment in complex and dynamic ways. These interactions determine the availability of resources, reproductive success, and the overall population growth dynamics. For instance, organisms compete for energy, space, water, and other resources critical for survival and reproduction. These relationships, whether symbiotic, competitive, or predatory, are central to understanding how populations expand or contract over time.

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