Answer: 1/5
Explanation: Please see the attachment!
as you see you got this problem wrong becuase Its c :)
btw i got same question are we on same schools lol
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 !!
<span>The heavy metals and toxins could affect the food web and reduce biodiversity.
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