Answer:
Plasma.
Explanation:
Plasma is the liquid component or constituent of the blood after the removal of all the cells and platelets. It is composed of 90% water, coagulation factors like antibodies, electrolytes, proteins , lipids e.t.c which help to maintain the blood PH and osmotic balance of the blood during the process of giving viscosity to the blood. The plasma comprises of 55% of the blood.
Alopecia areata is an autoimmune disorder that attacks the hair follicles, causing well-defined bald areas on the scalp or elsewhere on the body. It is a disorder that usually starts during childhood. It happens because the immune system would mistakenly attack the hair follicles where growth of hair starts. This condition is common for people younger than 20 years of age. It typically starts when group of hair would fall out resulting to areas of the scalp to be bald. Also, hair would appear thinner and weak that they would break easily. This condition could happen if you have a history of this in the family, have this at a you age, has other autoimmune disorder and prone to allergies.
It contracts on its own without input. The answer is C.
Hope that helped you.