The feeding relationships among the species in a community determine the community's a. secondary succession. b. ecological niche. c. species richness. d. trophic structure.

Verified step by step guidance

1. Step 1: Understand the question. The question is asking about the relationships between species in a community based on their feeding habits. This is a concept in ecology, the study of how organisms interact with each other and their environment.
2. Step 2: Review each of the answer choices and understand what they mean. 'Secondary succession' refers to the series of community changes that occur on a previously colonized, but disturbed or damaged habitat. 'Ecological niche' refers to the role and position a species has in its environment. 'Species richness' is the number of different species represented in an ecological community. 'Trophic structure' refers to the feeding relationships between organisms in a community.
3. Step 3: Compare the definitions of the answer choices to the question. The question is asking about feeding relationships, so we can eliminate 'secondary succession' and 'species richness' as they do not directly relate to feeding relationships.
4. Step 4: Between 'ecological niche' and 'trophic structure', 'trophic structure' is the more appropriate answer. While an organism's ecological niche does include its feeding habits, it also includes other factors like its habitat and behavior. 'Trophic structure', on the other hand, specifically refers to feeding relationships.
5. Step 5: Therefore, the correct answer is 'd. trophic structure'.