Earths early atmosphere apparently lacked
a) oxygen
b) carbon dioxide
c) water vapor
d) ammonia

Give the biological term for: structures that display characteristics of living organisms only within living cells

If water were a non polar molecule, how would its properties be different ? a.) water would be a much lighter molecule b.) water would be able to climb up inside plants c.)water would not be able to form hydrogen bonds d.) water would stick together much more strongly

What causes darkening of the skin as melanin production increases