The mineral fluorite is the mineral form of calcium fluoride.It is also called fluorspar. Its chemical formula is CaF2.
The mineral fluorite is used in the process to make steel and aluminium. It is used <span>as a </span>flux<span> in the manufacture of steel and other metals to eliminate </span>impurities<span>.</span>
The statement above is false. The blood levels of calcium is regulated by parathyroid hormone.When one is not getting adequate calcium in one's diet and the blood level of calcium is low, the parathyroid hormone will be released. The parathyroid hormone can increase the blood calcium in several ways:
1. by stimulating osteoclasts which break down bone and release calcium into the blood stream.
2. by increasing the amount of calcium re-absorbed by the kidney before it can be excreted in urine.
3. by triggering the formation of calcitriol which increases the absorption of dietary calcium at the intestines.
Planet earth was probaly formed 30,thousand years ago the first life probably evolved 29 thousand years ago
D. Phytoplankton are most efficient
Oxygen , Carbon , hydrogen