A company develops a new weed-killing chemical. When the chemical is first used, it kills nearly all the weeds. After 10 years, nearly all the weeds can tolerate the chemical and survive. Why?

The weeds are starting to resist the chemical and mutate and adapt to the chemical so they can survive.

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.