Question

Movement from low concentration to high concentration will require:

nothing or
energy/ATP

Answer 1

Actually no energy and is called diffusion

Answer 2

It requires ATP/energy

Step-by-step explanation:

This is also known as active transportation. Moving from a lower concentration to a higher concentration will cost wayyy more energy than moving from higher concentration to lower concentration. You could think of it as a current, going against the current is harder!