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Atoms
all matter is made of atoms, smallest level (chemical level).
Ex. Hydrogen, Oxygen, Nitrogen, Carbon
Molecules
are composed of 2 or more atoms. (can be the same /different kinds of atoms, large/ small substances)
Ex. O2, H2O, NaCl
cells/organelles
basic units of life
Ex. prokaryotic (archaea, bacteria) eukaryotic (plants, animals, protists, fungi)
tissue
group of similar cells working together to perform a function
Ex. 4 types: epithelial, connective, muscle, nervous
organs
2 or more tissues working together for a specific function
Ex. heart, lungs, kidneys, stomach
organ system
multiple organs working together to perform body function
Ex. cardiovascular, respiratory, digestive, urinary
organism
highest level, organ systems combine to form an entire living being