1. which biotic factor most directly affects the size of a deer population in an ecosystem a. air temperature b. annual precipitation c. number of birds d. number of plants 2. which group of organisms changes solar energy into chemical energy that living things use a. decomposersb. first level consumers c. producers d. second level consumers 3. which of the following best describes a role of mushrooms in ecosystemsa. capturing energy from sunlight b. consuming living plant material c. taking energy from animal hosts d. breaking down dead plant material 4. abiotic factors in an environment include all of the? a. plants, animals, fungi, and bacteria living in a habitat b. air, water and food that living organisms use to stay alive c. organisms, including those currently alive and those that were once living d. rocks, water, sunlight, nutrients, climates and other non living characteristics 5.which organism in a food pyramid receives the least amount of energy a. fox b. bird c. grasshopper d. grass