Ireceived a letter from national academy of future physicians and it says that you have been nominated for award? is it fake, or what?

answer; both surfaces of the membrane are nonpermeable

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.