sunlight and soil oxygen and carbon dioxide food and nesting areas soil and salt water
I gave my students this multiple choice question: What are two resources in terrestrial biomes that most vertebrates (animals with backbones) compete for?

Only one answer is correct among these 4 choices:
- sunlight and soil
- oxygen and carbon dioxide
- food and nesting areas
- soil and salt water

Could you tell me which one is correct?

food and nesting areas