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- The chemical level is the most basic level of organization.
- This level can be compared to the letters of the alphabet.
- It includes atoms, the smallest units of matter involved in chemical reactions.
- It also includes molecules, which are two or more atoms joined together.
- Important atoms for life include carbon (C), hydrogen (H), oxygen (O), nitrogen (N), phosphorus (P), calcium (Ca), and sulfur (S).
- An example is DNA (deoxyribonucleic acid), which carries genetic information from one generation to the next.
- Another example is glucose, also known as blood sugar.
- The chemical level of organization is discussed in Chapters 2 and 25.
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