Respuesta :

theblastmaster2000xd

Answer: the movement of ions or molecules across a cell membrane into a region of higher concentration, assisted by enzymes and requiring energy.

Explanation:

Requires energy input from a cell and enables A cell to move a substance against its concentration gradient

michelleee2023

Answer:

active transport is when molecules move across a cell membrane from a lower concentration to a higher concentration

Explanation:

active transport needs cellular energy to get this movement