Why is genetic variation necessary for natural selection to occur?

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

What types of energy transfers and energy transportations are involved in the domino chain reaction?

According to piaget, children have acquired the cognitive skill of conservation when they're able to a. understand that six ounces of liquid in a jar and six ounces in an elongated tube are equal. b. understand the viewpoint of other people. c. relate objects around them to their own needs. d. realize that the term heavy describes an object one way and the term big describes it another way. it is not b nor c. did this 2 x wrong..