The interaction of a community of organisms with its abiotic environment constitutes

Step 1: Analyze the question The question asks for the term describing the interaction between a community of organisms (the biotic part) and its abiotic environment (the non-living part, such as soil, water, temperature, light, and air).

Step 2: Explain the concept In ecology, the key terms are:

• Niche: the role or functional position of an organism in its habitat (what it eats, where it lives, how it interacts with others).
• Food chain: a linear sequence showing how energy passes from one organism to another (e.g., grass → grasshopper → toad → snake).
• Ecosystem: a community of living organisms interacting with one another and with the non-living components of their environment.
• Microhabitat: a small, specific living place within a larger habitat (e.g., under a rock or on a leaf). It is not about interaction.

Step 3: Work through the options

• A. Niche: describes an organism's role, not the interaction between a community and abiotic factors. ✗
• B. Food chain: involves only feeding relationships among organisms, with no abiotic component. ✗
• C. Ecosystem: biotic community plus abiotic environment, interacting together. ✓
• D. Microhabitat: just a small living space. ✗

Step 4: Answer The correct option is C. an ecosystem.

Exam tip: Remember the formula Ecosystem = Biotic community + Abiotic environment. Whenever a question mentions both living and non-living components interacting, think "ecosystem." A pond, a forest, or a farm are all good examples to recall.