Vitamins have many functions throughout the body. for example, vitamin d function as antioxidants, the function as coenzymes, and is important for calcium regulation.

(a) true
(b) false

(A) True

Explanation:

Vitamins are important for the human body because it plays an important function in the body like in metabolism, calcium absorption, releasing energy from food, cell damage repair, etc.  

For example, vitamin D can be made by the body itself. This vitamin is made by the skin when UV radiation from the sun falls on the skin. This vitamin act as membrane antioxidant and helps in inhibiting iron-dependent lipid peroxidation in cell's liposomes.

It also helps in calcium regulation in the body and without vitamin D the dietary calcium is not properly absorbed.

the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

i hope this : )

c. the initial amount of money placed in the savings account