Ecology.
The definition of ecology is: the branch of biology that deals with the relations of organisms to one another and to their physical surroundings.
This means that it is the study of how organisms interact with each other and their environment.
Not sure if it's right? Let's take a look at the other answers.
Definition of biosphere: the regions of the surface, atmosphere, and hydrosphere of the earth (or analogous parts of other planets) occupied by living organisms.
Definition of biotic: relating to or resulting from living things, especially in their ecological relations.
Definition of biome: a large naturally occurring community of flora and fauna occupying a major habitat, e.g. forest or tundra.
Hope this helps!
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