Answer: c. Internal statistics
1.could be guilt
2. they are not social
3. shy
Basically the main function of both of these has to do with blood. Arteries are important because they move blood away from the heart. Veins do the opposite of arteries and actually return blood back to the heart! They are both very important for the body.
<span>Sleep disturbances interfere with the persistence of memories</span>
