Answer
The answer is niche.
Explanation:
The definition of niche in biology is the organism's role in an ecosystem, which can be viewed as a community.
It is water pollution, since you are polluting the river.
Hope I helped!
The answer is A. Sea levels rose over 300 feet
Just like any ecosystem, a self-sustaining ecosystem needs light for primary production and nutrient cycling. The environment must find an ecological balance and be able to support the survival and reproduction of all organisms living inside it