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chemical level

the lowest level of organization that is composed of atoms and molecules

matter

anything that has mass and occupies space

atom

are the smallest particles that are considered matter

molecule

two or more atoms joined together

cell

the smallest living thing in an organism

organelles

the organs of cells

tissue

a bunch of cells grouped together so they can work together to accomplish a purpose (e.g. bone tissue structurally supports the body)

epithelial

tissue that covers or lines stuff

connective

tissue that has tons of extracellular matrix

extracellular matrix

stuff that surrounds the cells in a tissue (and is in fact produced by them)

organ

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)

carbon dioxide

what we breathe out

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