1) The sky appears blue during the day due to Rayleigh scattering, where sunlight passing through air molecules is scattered more by shorter wavelengths like blue. This scattering of blue light in all directions results in the sky appearing blue. 2) The chicken or egg dilemma is answered by the fact that a chicken egg requires proteins only found in a chicken's ovaries. So the chicken must have come first in order to lay the first chicken egg. 3) However, if referring more broadly to eggs in general rather than chicken eggs specifically, the egg would have come first through genetic mutation and evolution - a bird laid an egg containing a genetically mutated offspring that was the first chicken.