Which of the following statements describes active transport?(1 point) Responses [Movement of a substance against a concentration gradient. D] [Movement of a substance against a concentration gradient. D] Movement of a specific substance across a membrane. Movement of a specific substance across a membrane. Spontaneous movement of a substance through a semipermeable membrane. Spontaneous movement of a substance through a semipermeable membrane. Net movement of a substance from a region of higher concentration to a region of lower concentration
