In the winter its color changes to more resemble their <em>winter</em> surroundings, so they are more white, enabling them to blend in better with their white surroundings. In summer, its color changes to more resemble its <u><em /></u><em>summer</em> surroundings, so they are more brown like the rocks and ground around them.
The bile is produced by the liver and the gallblader only serves as storage between meals. The main stimulus for the release of bile from the gallblader comes from the nervous system,after food is put in the mouth.
<span>A. Pons. The pons includes nerves that have sensory roles in hearing, equilibrium and taste, as well as facial sensations like touch and pain, and motor function roles including facial expressions, eye movement, chewing and swallowing.</span>
