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Match the key words with the definitions.
Key words
atom, billion,cell,nerve cell,organ
1.one thousand million 2.a part of the body that has a particular purpose, e.g.the heart,the liver 3.the smallest piece of sth that can exist alone 4.a tiny part of the body that helps carry messages to and from the brain 5.a unit of living matter
billion
organ
cell
Nerve cell
atom
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