Environmental Science
Two opposite forces operate in the growth and development of every population. One of them is related to the ability to reproduce at a given rate. The force opposite to it is called

mortality
biotic control
fecundity
environmental resistances

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Environmental Science
Definition of ecosystem is

The part of the earth and its atmosphere which inhibits living organisms
A community of organisms interacting with one another
The abiotic component of a habitat
The community of organisms together with the environment in which they live

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