Diffusion, osmosis, and active transport are important processes in living organisms.
What is meant by the term osmosis?
Figure 11 shows part of a fish gill. 
Molecules of oxygen diffuse from the water into the blood capillaries of the gills. Which two changes will increase the rate at which oxygen diffuses into the gills? Tick (✓\checkmark✓) two boxes: [ ] Decreased water temperature, [ ] Decreased surface area of the gill lamellae, [ ] Increased concentration of oxygen in the water, [ ] Increased rate of water flow over the gills, [ ] Increased carbon dioxide concentration in the water.
Gas exchange is not the only transport process in organisms. Digested food molecules must be absorbed in the small intestine. Explain how the human small intestine is adapted for efficient absorption of digested food molecules.
Figure 12 shows a single-celled freshwater alga in pond water. 
Name the process by which water molecules enter the single-celled alga.
Potassium ions need a different method of transport into the alga. Explain how the potassium ions in Figure 12 are transported into the alga. Use information from Figure 12 in your answer.
Name of process: ___ Explanation: ___