Question

1. how is diffusion different from active transport?

Explanation:

Diffusion is passive (no energy, down concentration gradient, e.g., gas exchange). Active transport needs energy (ATP), moves against gradient (e.g., ion pumps), uses proteins.

Answer:

Diffusion is passive (no energy, down concentration gradient, random movement, e.g., O₂/CO₂ diffusion). Active transport requires energy (ATP), moves against gradient, uses carrier proteins (e.g., Na⁺/K⁺ pump).