Question

The relative abundance of $\underset{–}{\text{A}}$ and $\underset{–}{\text{B}}$ with respect to other elements is higher in any living organism than the Earth's crust. Choose the option that fills the blanks A & B correctly.

$\begin{array}{ccc}& \text{A}& \text{B}\\ \text{1}& \text{Calcium}& \text{Oxygen}\\ \text{2}& \text{Oxygen}& \text{Magnesium}\\ \text{3}& \text{Carbon}& \text{Silicon}\\ \text{4}& \text{Carbon}& \text{Hydrogen}\end{array}$

Answer 1

Answer (4)
The relative abundance of carbon and hydrogen w.r.t. other elements is higher in any living organism than the earth's crust.