What is it called when populations share their environment and interact with populations of other species?

Out of all of the answers given, "Community" fits the definition best and is most similar to the definition of a population. A biome is a naturally occuring community of flora and fauna in a habitat, such as a forest or jungle.

An ecoprovince includes an area of a one climate, such as a mountain range or plateau. A specifics is a group of living organisms that can breed with each other and exchange genes. An ecotone is the boundary between two distinct biomes, such as the line between a flat meadow and a tree-filled forest.