Ni do not understand the concept of amoeba's

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

Which of these organisms have the greatest amount of cell specialized

If two parents who's blood types are both b produce a child that has blood type o, what can you say about the parent's genotybes? oa) one is ii ob) one is ibi oc) both are bi od) nothing, this is impossible