Which materials are excreted through sweat glands in the skin?
carbon dioxide, hydrogen, and water
salt, urea, and water
urine, alcohol, and water
fats, ammonia, and water

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?