Answer:
The cosmic microwave background (CMB) is thought to be leftover radiation from the Big Bang, or the time when the universe began. As the theory goes, when the universe was born it underwent a rapid inflation and expansion. ... The CMB represents the heat left over from the Big Bang.
It would be the occipital lobe that is at the rear of the brain
materials that exist in nature and that are used by humans
(b) the managed consumption of natural resources to prevent their depletion or environmental destruction