the study of and policies related to the improvement of the human race via control over selective reproduction is referred to as

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.

plato users:

d.  

there was a variety of food available on island x, but there were only large seeds and nuts on island y.