Question

Which was ale sent in the atmosphere at the time of origin of life?

Options

• NH₃

• H₂

• O₂

• CH₄

Answer 1

H₂

Explanation:

In the early atmosphere, hydrogen atoms were the most abundant and most reactive. To make water, hydrogen atoms first compete with all oxygen atoms, leaving no oxygen. This primordial environment was a reducing atmosphere (devoid of free oxygen), as opposed to today's oxidising atmosphere (with free oxygen).