What term describes all the organisms living in a habitat?

The term that describes all the organisms living in a habitat is "community." In biology, a community refers to a group of different species that inhabit a particular area and interact with one another. This includes all plants, animals, fungi, and microorganisms that coexist in that environment, highlighting the various relationships and interdependencies that exist among them.

A population, while related, specifically refers to individuals of the same species living in a particular area at a given time. An ecosystem encompasses not only the living organisms (the community) but also the non-living components (such as soil, water, and climate) and their interactions. A biome is a larger ecological unit defined by specific climate conditions and types of plants and animals, such as a rainforest or desert, but it includes multiple communities within it. Thus, "community" is the most accurate term for all organisms living together within a specific habitat.