Given a scientific passage and an answer, generate a question for the given answer.

[EX Q]: Passage: Gene expression and protein synthesis are usually considered the same molecular process. Answer: protein synthesis
[EX A]: Gene expression and what else are usually considered the same molecular process?

[EX Q]: Passage: From a human point of view, natural resources can be classified as either renewable or nonrenewable. Answer: renewable or nonrenewable
[EX A]: How can natural resources be classified from a human point of view?

[EX Q]: Passage: Abnormally high activity of the parathyroid gland can cause hyperparathyroidism, a disorder caused by an overproduction of PTH that results in excessive calcium reabsorption from bone. Hyperparathyroidism can significantly decrease bone density, leading to spontaneous fractures or deformities. As blood calcium levels rise, cell membrane permeability to sodium is decreased, and the responsiveness of the nervous system is reduced. At the same time, calcium deposits may collect in the body's tissues and organs, impairing their functioning. In contrast, abnormally low blood calcium levels may be caused by parathyroid hormone deficiency, called hypoparathyroidism, which may develop following injury or surgery involving the thyroid gland. Low blood calcium. Answer: calcium
[EX A]:
Abnormally high activity or low activity of the parathyroid gland can cause disorders related to levels of what bone mineral?