Diffusion is the movement of particles from a region of higher concentration to a region of lower concentration. Yes, it is different from radiation.
What is conduction? How is conduction different from radiation? [2 MARKS]
What is internal Respiration?
It is diffusion of gases from lungs into the blood stream.
OR
It is diffusion of gases from lungs into the blood stream. and diffusion of gases from blood streams and lungs.