B. thick atmosphere
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Answer:
++
Explanation:
This is an example of ecological interaction where the actions of one organism is benefitting the other i.e. both organisms are benefitting from the relationship. This type of relationship is referred to as MUTUALISM.
In this example, the cellulose-digesting organism lives in the guts of the termite. The termite benefits from this association by getting its ingested cellulose (in form of wood) degraded or broken down. Termites feed on wood and naturally, they don't contain the enzymes that helps it digest it, hence, they depend on the enzyme secreted by these organisms in their guts to digest cellulose.
The cellulose-digesting organism gets shelter, protection and food in return as they cannot survive outside the termite's guts. Hence, it is a win-win (++) situation for the two organisms.
These are called mutations. although mutations can often be changed especially in diseases.
