Question

undisturbed communities with species compositions that remain stable over time are referred to as

keystone communities.

secondary successors.

climax communities,

primary successors.

Explanation:

• Keystone communities: Keystone species have a disproportionately large effect on their environment relative to their abundance. This term does not refer to stable - over - time communities.
• Secondary successors: Secondary succession refers to the process of ecological succession that occurs in an area where a disturbance has destroyed an existing community but left the soil intact. "Secondary successors" is not a standard ecological term for stable communities.
• Climax communities: A climax community is an undisturbed community that has reached a stable state in terms of species composition over time. It is the final stage of ecological succession.
• Primary successors: Primary succession occurs in an area where there is no pre - existing soil. "Primary successors" is not a valid term for stable, undisturbed communities.

Answer:

climax communities.