The universe is approximately ........... years old.

In their experiment,Urey and Miller mixed $CH_4, H_2, NH_3$,and water vapor in a closed flask and provided electrical energy at a temperature of ........ to simulate primitive atmospheric conditions. (in $^{\circ} C$)

The schematic representation of Miller's experiment is given below. What are $P$ and $Q$?

An experiment to prove that organic compounds were the basis of life was performed by

Which gases were formed first after the expansion of the universe?

Choose the correct option in terms of evolution.