Where does the energy used for active transport come from? O the nucleus of the cell
O the cell membrane
O the ATP molecule
O the carrier protein

I am thinking about the ATO molecule.

Hope it helps you.

the law of original horizontality explains:   why rocks appear in layers. correct answer: b the law suggests that all rock layers are originally laid down (deposited) horizontally and can later be deformed.   the principle is used by geologists to make assumptions about the relative ages of sedimentary rocks.