Describe the relationship between atp and adp and the importance of this relationship within a cell.

Let's think of ADP and ATP as a battery - ATP represents the full battery, ADP represents a partially full battery.

ATP has a extra Phosphate group, which it gives off for energy where it is needed in the cell. Then it becomes ADP, ADP regains the phosphate through cellular respiration and becomes ATP again. The cycle repeats indefinitely.

It's cell theory. easy name i would think.

It's either -limiting factors or -scarce resources but i'd go with my first answer since the food and water are abundant they really aren't scarce