Organisms may be divided into three groups based on how they obtain food. These groups are producer, decomposer, and consumer. Organisms containing chlorophyll are producers. Animals that eat other animals and plants are consumers. Thus, green plants are producers. Animals that eat other animals and plants are consumers. Microbes, one-celled organisms that cause the decay of dead plants and animals, are decomposers. Since decomposers cannot make their own food, they are also consumers.