Light waves compress as an object is moving toward an observer, causing the light to shift to the end of the electromagnetic spectrum.

Blue

Explanation:

Light waves compress as an object is moving toward an observer, causing the light to shift to the blue end of the electromagnetic spectrum

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".

well the answer is 2!