Which term refers to any living part of the environment with which an organism might interact?

The term that refers to any living part of the environment with which an organism might interact is "biotic factor." Biotic factors include all the organisms that make up a biological community, such as animals, plants, fungi, and microorganisms. These living components of an ecosystem can affect an organism's survival and reproduction by providing resources like food, shelter, and mates, or by competing for these same resources.

In contrast, abiotic factors are the non-living physical and chemical elements in the environment, such as temperature, water, sunlight, and minerals. The physical environment encompasses both biotic and abiotic factors but doesn't focus solely on the living components. An ecological niche refers to the role or function of a species within an ecosystem, including how it meets its needs for food and shelter, which ties back to its interaction with biotic factors but is not itself a term that strictly describes the living entities. Thus, biotic factor is the most direct answer to the question about living components in the environment.