For giving you understanding ; we need Free O2 but Oxygen is also available in H20 right why dont we use it !!
As the early atmosphere was reducing as there was no free oxygen but it was later produced by chemoautotrophic bacteria !! Living thing release O2 in atmosphere thus making it oxidising in nature and then life evolves !!
Andrew Jackson was a man who work very hard at his adulthood and became rich due to his hard efforts
he was inherited with wealth ,he was very humble person and was born poor and was a common man
so correct option is D hope it helps<span />
<span>Atoms that have filled outermost energy levels and do not participate in chemical bonding are called Inert Atoms. Remember this by thinking of the definition of Inert; meaning unable or not having the strength to move. So if it an atom has a filled outer level the electrons will be inert.
</span>
There is no diagram?dudidjdjdjdd dhhdjdd