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14 Cards in this Set

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What is a the niche of an organism>
The role and position a species has in its environment; includes all biotic and abiotic interactions as a animal meets its needs for survival and reproduction.
Define biosphere
The portion of the Earth that supports life; extends from the atmosphere to the bottom of the oceans.
Define ecology.
The scientific study of interactions among organisms and their environments.
Define habitat
The place where an organism lives out its life.
What is a scavenger?
Animals that feed on animals that have already died.
What is a community?
A collection of several interacting populations that inhabit a common environment.
Define ecosystem.
The interactions among populations in a community; the community's physical surroundings, or abiotic factors.
What is a population?
A group of organisms of one species that interbreed and live in the same place at the same time.
What is a decomposer?
Organisms that break down and abosrb nutrients from dead organisms.
What is a decomposer?
Organisms that break down and abosrb nutrients from dead organisms.
Define the term "food chain".
A simple model that shows how matter and energy move through and ecosystem; it can consist of three steps, but must have no more than five steps.
What are biotic factors?
The living organisms that inhabit an environment.
What are abiotic factors?
The nonliving parts of an organism's environment like temperature, moisture and light.
What is a food web?
A model of a community that shows all the possible feeding relationships at each trophic level.