The variety or differences among living organisms within an ecosystem. The more diverse an ecosystem is the more stable it is.

The place where an organism lives and that provides the things the organism needs.

A group of organisms that are physically similar and can reproduce with each other to produce fertile offspring.

A single individual animal, plant, or single celled life form. The smallest unit of organization.

All the members of one species in a particular ecosystem.

All the different populations that live together in an ecosystem.

Count every organism one at a time. This is the only exact way to find population size, but also the most difficult.

Observing tracks of animals or signs that animals are in the ecosystem, but never actually seeing them. Not an exact way to determine population size.

Counting the number of organisms in a small area and then multiplying that number by the entire area of the ecosystem. This is a form of estimating population size.

A group of animals is captured, marked, and released back into the ecosystem. Then on another day animals are captured and the number of those that have marks help determine population size.

The number of individuals in a specific area. # of individuals divided by the area of the ecosystem.

The maximum number of individuals of a population that a particular environment can support over a period of time.

The ratio of births to the number of organisms in a population over a given time period.

The ratio of deaths to the number of organisms in a population over a given time period.

The movement of individuals into a population or ecosystem.

The movement of individuals out (exit) of a population or ecosystem.

Factors that can limit the growth of a population. Food, water, space, shelter and weather are good examples.

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