The smallest chemical unit of matter
Two or more atoms linked together to make a substance with unique properties
The process by which green plants and some other organisms use the nergy of sunlight and simple chemicals to produce their own food
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
Special structures that allow living organisms to sense the conditions of their internal or external enviorment
The smallest unit of life
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