10 is 4
11 is 3
15 is 3 (where it says 3 ok)
<span>D. Temperature and pH can affect how enzymes work.</span> The action of enzymes can be affected by many factors including temperature, pH and ionic strength. Optimum pH differs per enzyme. Enzymes can be destroyed by heat more than the allowed optimum temperature.
Oxygen enters the blood in the A. Bronchi.
