The best option from the list in terms of another term for the responding variable would be "<span>dependent variable" because it's dependent on the other primary variable. </span>
ATP
Explanation:
ATP is produced in the cells and its conversion to energy is a single-step process.
Youngest to oldest would be: 3, 4, 1, 5, 2. Since it's from the bottom, the ones furthest from the bottom would be the youngest at the top. The oldest fossils would be closest to the bottom.
The Neural Stem Cells. Hope this helped!