Atype of transport of a solute across a membrane, up its concentration gradient, using protein carriers driven by the expenditure of chemical energy is known as osmosis. diffusion. facilitated transport. active transport. exocytosis.

Active transport

Explanation:

Active transport refers to the movement of substances up the concentration gradient, which is from the region of their lower concentration to that of the higher concentration. Active transport requires the input of energy to transport the substances against their concentration gradient. It occurs via some membrane proteins that serve as carrier proteins or pumps.

For example, the sodium-potassium pump is a carrier protein uses the energy released during ATP hydrolysis to export three sodium ions (Na+) and import two potassium ions (K+).

Speed of light

Explanation:

you can measure only the speed of light in numbers. the others can't be measured in numbers.