<span>Plants take in oxygen all the time for respiration.
Photosynthesis which begins by combining water and CO2, continues in the
"dark phase" in making the glucose molecule. Light is not used for this
part of the reaction so it is called dark , because light is needed for
the first part.
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Yo that’s dark. Like dark.
Four; the upper atmosphere, the atmosphere, the mantle, and the core.
I believe the answer is 3d^6 4s^2
The Earth was first considered habitable when we discovered that it was Microbial organisms that started the process. I would go with D.
