Because it serves as protection for a vital organ in the body. Also if the skull could move it would make the brain very vulnerable.
Answer: C. there is more silicon than calcium at the surface of the earth
Explanation:
Geographical Isolation would most likely result in this population becoming a New species.
<span>The hypothalamus in the brain plays a primary role in regulating body temperature. When a person is exposed to a cold environment, the hypothalamus senses such a change, causing the body to undergo changes that conserve heat (blood vessels constrict, muscle cells contract involuntarily, a process referred to as shivering). Conversely, when one is exposes to excess heat, the hypothalamus also senses such an environmental change, and triggers physiological processes such as sweating and the dilation of blood vessels.</span>
