Yes.
Tooth enamel (calcium phosphate) is the hardest substance found naturally in the human body. Unless you're wolverine, who contains adamantium. Or unless you swallow a diamond by accident.
No, melanin protects the skin from ultraviolet radiation. Vitamin D is synthesized in the skin and help with calcium absorption.
There is a problem with your question, there is NO BLACK LIGHT! Radiation--electromagnetic waves--visible light, infrared radiation, etc. Light can only be invisible, not black.
No. It, in fact, is the opposite. Vitamin D is absorbed in the intestine, converted by UV radiation in the skin, and then helps absorb Calcium into the body. Vitamin D deficiency can be caused by a few things, a diet low in Vitamin D, low sun exposure, or it could be caused by a tumor in the parathyroid gland (but if you have low Calcium, that is not possible).
Calcium is calcium-it is its own nutrient.
the 3 elements found in calcium sulfate are calcium,sulfur and oxygen
Diamond No its calcium.
Yes, they are calcium salts.
Ca is the periodic symbol for Calcium. S is the periodic symbol for Sulfur. As such, CaS2 is a compound of calcium and sulfur.
Sodium chloride doesn't contain calcium. Calcium chloride contain calcium.
Calcium is an element, so calcium makes up calcium.
Milk