food chain - A series of events in which one organism eats another and obtains energy., food webs - all the food chains (in an area at a time), energy pyramid - diagram that compares energy used by producers, primary consumers, and other trophic levels, trophic level - Each step in a food chain or food web or each layer of an energy pyramid, sunlight energy - Energy that comes from the sun. Plant cells capture this using chloroplasts in the process called photosynthesis., photosynthesis - Conversion of light energy from the sun into chemical energy., producers - Organisms that make their own food, consumers - An organism that obtains energy and nutrients by feeding on other organisms, primary consumers - animals that feed on producers; herbivores, secondary consumers - carnivores that eat herbivores, tertiary consumer - A carnivore that eats secondary consumers, apex predators - Also known as "top carnivores", the animals in any ecosystem occupying the top trophic level; apex predators do not have any natural predators, decomposers - Organisms that break down the dead remains of other organisms, herbivore - organism that obtains energy by eating only plants, omnivores - Consumers that eat both plants and animals., carnivores - Consumers that eat only animals,

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