Once the food is swallowed, it passes throught the what

It passes though the oesophagus or the food pipe.

Hope this helps :)

esophagus

Explanation:

Once food is swallowed, it passes through the esophagus into the stomach

the answer is b.) hydrogen bonds between bases.

answer; the tunica intima also called tunica interna, consists of elastic fibers,connective tissue and smooth muscle cells;