the lowest level of organization that is composed of atoms and molecules
anything that has mass and occupies space
are the smallest particles that are considered matter
two or more atoms joined together
the smallest living thing in an organism
the organs of cells
a bunch of cells grouped together so they can work together to accomplish a purpose (e.g. bone tissue structurally supports the body)
tissue that covers or lines stuff
tissue that has tons of extracellular matrix
stuff that surrounds the cells in a tissue (and is in fact produced by them)
a combination of two or more types of tissue that perform a complicated function (e.g. the stomach has epithelial and muscle tissue and it digests food)
what we breathe out
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