Q.

The most abundant element by number in the living system is :

A. Nitrogen
B. Hydrogen
C. Oxygen
D. Carbon
Answer» B. Hydrogen
Explanation: In sequential order, Hydrogen. Oxygen, Carbon and Nitrogen are the most abundant elements by number in the living system. Hydrogen constitutes 49.8% of living systems, while Oxygen constitutes 24.9%; Carbon and Nitrogen account for 24,9% and 0.27% respectively. It is not surprising, therefore, that the living cell is between 60% and 90% water.
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