Describe the following
mutualism
commensalism
parasitism

Mutualism: It is the biological interaction between two organisms in which both the organism gets benefit from each other. For example- butterflies take nectar from the plant's flower and spread the pollen to the next flower. So both the individuals gets the benefit from each other.

Commensalism: It is the interaction between two organisms in which one individual is benefitted and other is not harmed not benefitted. For example, remora fish attaches to the body of big fishes to travel so it gets benefitted and big fishes are neither harmed not benefitted by this interaction.

Parasitism: In parasitism, one individual is harmed and another is benefitted. For example, tapeworm is a parasite that gets its nutrition from its host and host gets weaker because of lack of nutrients. So tapeworm is benefitted and the host is harmed.

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.