Thinking things through, and looking for all possible outcomes. If you think of all possible outcomes, then you will be prepared and more likely to solve the problem you are solving. This applies to every problem. Also, look at things from different angles.
The answer would be C.mountains
<span>That would be "Chorionic Villus Sampling"</span>
food goes into the human digestive system through the mouth before then moving through the pharynx, then esophagus, then stomach,then intestines, rectum and anus.
