Exchange of Substances in Biology

What is diffusion?

What is osmosis?

Which structure controls what enters and leaves a cell?

Why does active transport require energy?

In gas exchange, why are alveoli well suited for the exchange of substances?

A cell takes in a mineral ion from a dilute solution even though the concentration inside the cell is already higher. Which process is most likely involved?

Diffusion is a passive process that does not require energy from the cell.

Osmosis involves the movement of solute particles through a partially permeable membrane.