First one is D. I think because, and then, also this and that. then
The sac that the hair fiber grows in is called the
<span>hair follicle. </span>
Answer:
Vein: A blood vessel that carries blood that is low in oxygen content from the body back to the heart. The deoxygenated form of hemoglobin (deoxy-hemoglobin) in venous blood makes it appear dark. Veins are part of the afferent wing of the circulatory system, which returns blood to the heart.
Explanation: