proton, neutron, electron

Carbon, Hydrogen, Oxygen

water, glucose, CO2,

mitochondria, chloroplast, nucleus

basic unit of life, example: neuron

group of cells functioning together, example: muscle, nervous, connective

liver, heart, kidney

circulatory, respiratory, immune

human, bear, smail, apple tree

a group of rabbits living together

rabbits, bears, and snakes all living together

bears, snakes, water, elevation, wind, soil, precipitation, bacteria - all in one area

tropical rain forest, desert, freshwater lake, chaparral

the entire area on Earth where life exists

new properties present at one level that are not seen in the previous level

Group of atoms held together by bonds

Structure within cell that perform specific function

Group of similar cells that perform a specific function

A structure usually composed of several tissue types that form a functional unit

Two or more organs working together to perform a specific function

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