AP BIOLOGY

Detailed explanation-1: -An organism that may occupy more than one trophic level simultaneously is a sparrow. Sparrow is a primary consumer when it eats seeds, fruits, peas and a secondary consumer when it eats insects and worms.

Detailed explanation-2: -In a pond ecosystem, fish occupy more than one trophic level. In the food chain of pond ecosystems, phytoplanktons are the producers which are consumed by the zooplanktons and fish directly and these are called primary consumers.

Detailed explanation-3: -Thus, the correct answer is ‘Sparrow.

Detailed explanation-4: -They eat primary producers-plants or algae-and nothing else. For example, a grasshopper living in the Everglades is a primary consumer. Some other examples of primary consumers are white-tailed deer that forage on prairie grasses, and zooplankton that eat microscopic algae in the water.

Detailed explanation-5: -Many consumers feed at more than one trophic level. Humans, for example, are primary consumers when they eat plants such as vegetables. They are secondary consumers when they eat cows. They are tertiary consumers when they eat salmon.