why do the life cycle and skin of frogs make it a good indicator animal if you want to determine the health of the local ecosystems?

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..

(amoeba sisters video recap: pedigrees and need

2polnis which of the following is an advantage of an in vitro experiment?me