The radioactive rock inside of the earth A) is hot
B) is caused by volcanoes
C) glows in the dark
D) is cold

Explain why in any given geographical region, women tend to have lighter skins( by 3-4% on average) than men?

Color blindness is a recessive trait. the gene for color blindness is on the x chromosome. the family tree below shows the trait of color blindness. the only unknown is the mother in the first generation

What causes darkening of the skin as melanin production increases