Do the structures in an organism relate to their functions?

Average annual precipitation and are the two major features that define the biomes on earth.

In many humans, exposing the skin to sunlight over prolonged periods of time results in the production of more pigment by the skin cells (tanning). this change in skin color provides evidence that -

Hershey and chase confirmed that dna, not protein, was the genetic material. how do the results of their two experiments support this conclusion?