Biology Unit 2

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5 Terms

1
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What is everything made of?

Atoms

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What is an atom?

An atom is the building blocks of molecules.

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What is a molecule?

A molecule is the general term used to describe any atoms that are connected by chemical bonds.

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Generally, how big is a molecule?

A molecule is smaller than a wood cell.

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What are the three common atoms in biology?

Carbon, Oxygen, Hydrogen