What is the "amino acid pool" and where do these amino acids come from?

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."

the answer would be..

b. sucking

b) the inside picture would look at a very high temperature in a very low ph

one part of the electromagnetic spectrum that arrives on earth as solar radiation from the sun is the visible spectrum. wavelengths of the visible spectrum combine to form what we refer to as

answer - d) ultraviolet radiation.

violet /   380–450 nm / 668–789 thz

violet is number 1 in the chart of visible light.