This is the common passage way for air, food and water.

Oropharynx

Explanation:

Oropharynx is a common route for both the respiratory and the digestive systems.  

The passage for the air, and the passage for the food and the liquid (water), begin separately at nose and mouth respectively. Air passes backward through nasopharynx. On the other hand, food and the liquid (water) pass backward through oral cavity. The two passages unite at the oropharynx.

The two passages then separate again in the hypopharynx. The food and the liquid pass backward into esophagus which leads to the stomach. The air we breath passes forward through larynx and then into trachea which leads to the lungs.

answer: the answer is d.

explanation: this is because when you exercise you make your muscle produce a certain liquid, that does not evaporate it.   also when you exercise you do not reduce muscle fiber.   and it does not really control your twitch that much.