Elements of Life

AP Biology· difficulty 1/5

Approximately what percentage of living matter (by mass) is composed of just C, H, O, and N?

A
$96%$
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B
$20%$
C
$75%$
D
$50%$

Explanation

These four elements account for ~96% of biomass; trace elements (P, S, Ca, K, etc.) make up the rest.

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