hierarchy life triangle

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7 Terms

1
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Atoms

all matter is made of atoms, smallest level (chemical level).

Ex. Hydrogen, Oxygen, Nitrogen, Carbon

2
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Molecules

are composed of 2 or more atoms. (can be the same /different kinds of atoms, large/ small substances)

Ex. O2, H2O, NaCl

3
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cells/organelles

basic units of life

Ex. prokaryotic (archaea, bacteria) eukaryotic (plants, animals, protists, fungi)

4
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tissue

group of similar cells working together to perform a function

Ex. 4 types: epithelial, connective, muscle, nervous

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organs

2 or more tissues working together for a specific function

Ex. heart, lungs, kidneys, stomach

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organ system

multiple organs working together to perform body function

Ex. cardiovascular, respiratory, digestive, urinary

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organism

highest level, organ systems combine to form an entire living being