Question

1. what are three reasons why cells need energy?

Explanation:

Cells need energy for several biological processes. One key reason is for active transport, which moves substances against their concentration gradient. Another is for synthesis of macromolecules like proteins, nucleic acids, etc. Also, energy is required for cell division, a fundamental process for growth, repair, and reproduction.

Answer:

Three reasons cells need energy are: active transport (to move substances against concentration gradients), synthesis of macromolecules (such as proteins, nucleic acids), and cell division (for growth, repair, and reproduction).