The complex relationship between the members of a community and their physical environment is known as________

1. Analyze the question The question asks for the term that describes the complex relationship between living members of a community and their physical environment. The key words are "community" and "physical environment."

2. Explain the concept

• Ecology is the scientific study of the interrelationships between living organisms and their physical (abiotic) and biological (biotic) environment. It covers how organisms interact with each other and with factors like soil, water, light, and temperature.

Now let's look at the other options:

• Commensalism is an association between two organisms in which one benefits and the other is neither harmed nor helped (e.g., an orchid growing on a tree).
• Symbiosis is a close living relationship between two different species (e.g., mutualism). It concerns organism-to-organism relationships, not the physical environment.
• Saprophytism is a mode of feeding in which an organism (e.g., mushroom, mould) gets nutrients from dead and decaying organic matter.

3. Show the solution

• The relationship is between the community and the physical environment, so it is not limited to two species. That rules out commensalism and symbiosis.
• It is not about feeding on dead matter, so saprophytism is out.
• The only term that covers the interaction of organisms with their surroundings is ecology.

4. Answer The correct option is D. ecology.

5. Tip Think of the root words: eco = "home/house" and logy = "study of." So ecology is the study of organisms in their "home," meaning their environment. Whenever a question mentions organisms and their surroundings, think ecology. Terms like commensalism, symbiosis, and saprophytism describe relationships or feeding between organisms.