No body going to understand the response if you don't have whats its about on here but a little tip is you can go and into a few key sentences and highlight the main words to help you under stand the question or response better.
Hope I helped
A .Pale blue Its this color because the color comes from the fact that it absorbs all wavelengths of light other than those in the blue region.
The symptoms of the disease/virus itself.
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 !!
