Science Chapter 3 Vocabulary Tools A B chlorophyll a green material in plants that traps energy from sunlight and gives plants a green color carbon dioxide a gas in the air photosynthesis the way in which green plants trap the sun's energy and use it to change carbon dioxide and water into sugar producer a living thing that can use sunlight to make sugars consumer a living thang that depends on producers for food herbivore a consumer that eats only producers carnivore a consumer that eats only other consumers omnivore a consumer that eats producers and other consumers food chain the path energy and materials take in a community predator a consumer that hunts, kills, and eats other animals prey the animal that predators hunt and eat decomposer a consumer that puts materials from dead plants back inot soil, air, and water algae a group of producers that live in the oceans and other water food web the flow of energy and materials through food chains that are connected pollution the addition of harmful substances to a community