Explanation:
the exosphere is the outermost layer of our atmosphere answer is d
The pelagic zone can be contrasted with the benthic and demersal zones at the bottom of the sea. The benthic zone is the ecological region at the very bottom of the sea. It includes the sediment surface and some subsurface layers. Marine organisms living in this zone, such as clams and crabs, are called benthos.
Is a permanent alteration in the DNA sequence that makes up a gene.
