Please help me with this question:)

Energy

Explanation:

Active transport requires energy to move substances across a plasma membrane, often because the substances are moving from an area of lower concentration to an area of higher concentration or because of their large size. Two types of active transport are the sodium-potassium pump and vesicle transport.

They would soon die if you remove the food source keeping them alive, but if you add another apple it would make the fruit flies thrive again if not create more population