EASY 100 POINTS!! PLEASE HELP, I NEED THE GRADE! Match the options (on the left) with the correct option (on the right)

Differences between compact bone and cartilage

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..

Ascientific idea becomes valid when it is what?