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All the parts of the planet that are inhabited by living things; sum of all Earth's ecosystems and biomes
A group of populations living and interacting with each other in a common habitat-plants and animals
the study of changes in birth rate, death rate, and migration that affect the total number of organisms in a given ecosystem
the circumstances or conditions that surround an organism or group of organisms as well as the complex of social or cultural conditions that affect an individual or community
describes the number of individual organism present in a given population at a given time
describes how a populations initial exponential increase is slowed and finally stopped by limiting factors
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