Look at the following statement. What word completes the second gap? Substances move by diffusion from an area where they are __________ concentrated to an area where they are __________ concentrated.

What is the missing word? __________ substances can move into or out of cells by diffusion.

Diffusion occurs when a substance is at aconcentration in one region, and at a lower concentration in another region. This differencein is called the concentration .

This process works because different dye particles dissolve and travel at different __________ . What word completes the gap?

Simple diffusion is the movement of molecules from areas of ______ concentration to areas of ______ concentration.Multiple choice question.lower; lowerhigher; lowerhigher; higherlower; higher

Which important word is missing from the definition of diffusion below?The spreading out of particles of a gas, or any substance in solution, resulting in the movement from an area of higher concentration to an area of lower concentration.netsolidsmovementliquid