3 rows are shown. The top row labeled ‘The ‘Big 4’ make up 96% of living matter’ contains 4 spheres representing atoms which are labeled ‘H’, ‘C’, ‘N’ and ‘O’ from left to right respectively. The center row labeled ‘Some lesser elements’ contains 4 spheres representing atoms which are labeled ‘P’, ‘S’, ‘Ca’ and ‘Na’ from left to right respectively. The bottom row labeled ‘Some trace elements’ contains 4 spheres representing atoms which are labeled ‘Fe’, ‘Cu’, ‘Co’ and ‘Zn’ from left to right respectively.
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The "Big 4" make up 96% of living matter
