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A niche is the place where a particular organisms are adapted
Zonation
Ecosystem or ecological system
All organisms require water to live.
Organisms live everywhere
population
Benthos
The ecosystem is a collection of all the organisms that live in a particular place, together with their nonliving environment. Something like mineral soil would be an example of a nonliving component.
A niche is the place where a particular organisms are adapted
they have aeroby
Ecosystem
Zonation
biodiversity
Carrying capacity is how many organisms can live in a region, so how many resources that region has determines the carrying capacity. The organisms are in competition with each other for those resources.
Ecosystem or ecological system
Because they like to live with each-other and deal with it if they don't
A population is a group of organisms of the same kind that live together and reproduce in a particular place.