AP BIOLOGY

Detailed explanation-1: -Humans can play both direct and indirect roles in the food web. They play directly into the food web as primary or secondary consumers. Primary consumers typically eat plant-based products, while secondary consumers eat the meat of other organisms.

Detailed explanation-2: -Consumers constitute the upper trophic levels. Unlike producers, they cannot make their own food. To get energy, they eat plants or other animals, while some eat both. Scientists distinguish between several kinds of consumers.

Detailed explanation-3: -Food webs demonstrate how organisms interact. The three roles demonstrated by all animals, plants, bacteria and other living organisms are those of producers, consumers and decomposers.