Answer:
a)The brain is protected by the bones of the skull and by a covering of three thin membranes called meninges.
b) Even before you leave the womb, your brain works throughout your life to control your body's functions and helps you understand and interact with the world around you.
Explanation:
Yes it does the chemicals in whatever you are smoking are more than likely altered from what it originally was, therefore the chemicals start to taint the blood vessels and damage them permanently.
Travelers maybe? Visitors
They are produced by specialized white blood cells called B lymphocytes<span> (or B cells). </span>
