Wisdom teeth are often given as an example of a vestigial trait. why?

 because they are not that useful in humans But they are useful in species that appear to be ancestral ... specifically in the species, we can identify by fossils as having had a larger jawbone where the extra wisdom teeth *were* useful. Another sign of a vestigial feature (although not necessary) is that is completely absent in a small percentage of individuals ... as wisdom teeth are. 

Nothing will delay it, but drinking some lemon (squeeze 3) would cut it, making it last a few days, but its not good to do that. won't hurt you but the next month will be more cramps.. take some advils with you on the trip

Air goes past the epiglottis and into the trachea when you breathe in. from there, it goes to your vocal cords in the larynx until it reaches the bronchi. from the bronchi, air passes into each lung.