I need help i dont understand

I’m doing some practice exam questions for biology, and i’m not sure how to do these 3 parts to the question.

In this case, the statement that people who exercise for an hour may have lower cholesterol levels is .

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..