The population ............ is the number of invdividuals in a population.

............... is a form of symbiosis that benefits one species and harms the other.

A ............ is a simple way of showing how energy, in the form of food, passes from one organism to another.

Changing nitrogen gas to nitrogen in the soil is called ..............

The role or job of an organism in the ecosystems is a .............

............ is a very important abiotic factor and is the main compound in cell fluids.

........... factors are the non-living factors in an enviroment.

........... is the study of interactions among organisms and their environment.

.......... is need for recyling matter.

A .......... limits the number number of organisms in an environment.

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