Is there evidence for simultaneous co-evolution of Earth's atmosphere and life on Earth?
In other words, is there a connection between the development of the atmosphere and
the development of life on Earth?

3. in the fruit fly, recessive mutation brown, b, causes brown color of the eye and absence of red pigment. recessive mutation p of another independent gene causes purple color of the eye and absence of brown pigment. the cross of a brown-eyed female and purple-eyed male produced wild type eyes. what will be the colors and their ratio in f2?