What is a hypertonic solution?
Where the concentration of solutes in the solution outside the cell is higher than the concentration inside the cell.
What does oxygen do by diffusion?
It moves in and out cells.
What do lungs have to improve the efficiency of gas exchange?
They have a large surface area.
What does active transport use?
Energy from respiration.
What is one of the things a sperm has?
A tail for swimming.
What are bacteria an example of?
They are an example of prokaryotic cells.