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20 Cards in this Set

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abiotic factor
the non-living parts of an organism's enviornment
biosphere
the portion of Earth that supports life
biotic factor
all the living organisms that inhabit an enviornment
commensalism
is a symbiotic relationship in which one species benefits and the other species is neither harmed nor benefitted.
community
is a collection of interacting populations
ecology
is the scientific study of interactions among organisms and their environments
ecosystem
is made up of the interactions among the populations in a community and the community's physical surroundings or abiotic factors
habitat
is the place where an organism lives out its life
mutualism
a symbiotic relationship in which both species benefit
niche
a role and position a species has in its environment - how it meets its needs for food and shelter, survival, and reproduction
parasitism
a symbiotic relationship in which one organism derives benefit at the expense of the other
population
is a group of organisms of one species that interbreeds and lives in the same place at the same time
symbiosis
means living together
autotroph
organisms that use energy from the sun or energy stored in chemical compounds to manufacture their own nutrients
heterotroph
organisms that cannot make their own food and must feed on other organisms
scavenger
such as black vultures feed on carrion and refuse, and play a beneficial role in the ecosystem
decomposer
break down and absorb nutirents from dead organisms
food chain
a simple model scientists use to show how matter and energy move through an ecosystem
trophic level
organism in a food chain that represents a feeding step in the passage of energy and materials through an ecosystem
food web
model that expresses all the possible feeding relationships at each trophic level in a community