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photosynthesis The process by which plants and some other organisms capture the energy in sunlight and use it to make food. autotroph An organism that makes its own food. heterotroph An organism that cannot make its own food. pigment A colored chemical compound that absorbs light. chlorophyll A green pigment found in the chloroplasts of plants, algae, and some bacteria. stomata Small openings on the underside of a leaf through which oxygen and carbon dioxide can move.