Question

the principal force driving movement in diffusion is ________.

• concentration gradient
• temperature
• membrane surface area
• particle size
• surface area to volume ratio

Explanation:

Diffusion is the net movement of particles from an area of higher concentration to an area of lower concentration. The concentration gradient, which is the difference in particle concentration between two regions, is the core force that drives this movement. The other factors listed (temperature, membrane surface area, particle size, surface area to volume ratio) affect the rate of diffusion but are not the principal driving force.

Answer:

concentration gradient