Biology and Earth Science Practice Test 2026 – Master Forces, Magnetism, Moon Phases, Microbiomes, and Ecosystems with This All-in-One Study Guide!

Organisms that can synthesize energy storage molecules such as glucose are producers. They capture energy—usually from sunlight—through photosynthesis and convert carbon dioxide and water into glucose, storing energy in its chemical bonds. These producers, like plants and many algae, form the base of ecosystems because other organisms rely on the energy they store. Consumers obtain energy by eating other organisms; decomposers break down dead matter to recycle nutrients; and predators are carnivorous consumers that hunt living prey. Therefore, the term that best describes an organism that makes its own energy storage molecules is producer.