What marked the end of the precambrian period? a. the appearance of complex, multicellular animals b. the division between archaea and eukarya c. the emergence of simple, protist-like animals d. the development of dna-based viruses

The Appearance of complex, Multicellular animals

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.