Which of the following is necessary for two organisms to be considered as coexisting in a mutualistic relationship? One organism benefits while the other neither benefits nor is harmed.

One organism benefits while the other is harmed.

Both organisms are harmed from the relationship.

Both organisms benefit form the relationship.

acid rain does not usually kill trees directly. instead, it is more likely to weaken the trees by damaging their leaves, limiting the nutrients available to them, or poisoning them with toxic substances slowly released from the soil. the main atmospheric pollutants that affect trees are nitrates and sulphates.

one negative thing it that it can kill water animals. another negative thing is it can cause the destruction of ecosystem. one way water pollution can be reduced is to conserve energy.