The last one (d) I think it is the correct one
The parathyroid gland releases a hormone that dissolves some of the calcium in bones moving it to the blood. This is a result of an increasing number of osteoclasts which results in the release of calcium ions into the bloodstream.
They will be found in the desert areas like Mexico, Arizona, and Utah.
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that lightning sparked chemical reactions in Earth's early atmosphere. The early atmosphere contained gases such as ammonia, methane, water vapor, and carbon dioxide. Scientists hypothesize