Need ! (science)
which describes a method of active transport?

(a)water moves through the cell membrane by osmosis.

(b)proteins carry molecules into or out of the cell.

(c)molecules move into or out of a cell due to concentration.

(d)cells rely on external energy to move molecules.

Answer;

(D)Cells rely on external energy to move molecules.

Explanation;Active transport is the movement of dissolved molecules into or out of a cell through the cell membrane, from a region of lower concentration to a region of higher concentration using energy in the form of ATP.In this type of transport,particles move against the concentration gradient, using energy released by hydrolysis of ATP.Examples of active transport includes; uptake of glucose in the small intestines and uptake of ions from the soil by root hair cells in plants.

The  grandmother cell  is a hypothetical  neuronthat represents a complex but specific concept or object.[1]  it activates when a person "sees, hears, or otherwise sensibly discriminates"[2]  a specific entity, such as his or her grandmother. the term was in use at least as early as 1966 amongst staff and students in the department of experimental psychology, university of cambridge, england. a similar concept, that of the  gnostic neuron, was proposed two years later