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Atom

The smallest chemical unit of matter

Molecule

Two or more atoms linked together to make a substance with unique properties

Photosynthesis

The process by which green plants and some other organisms use the nergy of sunlight and simple chemicals to produce their own food

Metabolism

The sum total of all processes in an organism that convert energy and matter from outside sources and use that energy and matter to sustain the organism's life functions

Receptors

Special structures that allow living organisms to sense the conditions of their internal or external enviorment

cell

The smallest unit of life

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