Earth is responsible for the increase of oxygen in which development

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 -

When proteins are being produced by a cell, scientist say that the genes are question 2 options: activated turned off replicated deactivated

What is the process of pulling apart an n2 molecule nevermind i got it