Detailed Instructions: In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.
Problem:In plants, this element opposes the action of potassium to close stomata while in the body, the sarcoplasmic reticulum stores and releases ions of this element. In the body this metal is typically found in the form of hydroxyapatite and the parathyroid hormone increases concentration of it in the blood. This element is also released into the blood through a process of resorption regulated by osteoclasts. In nature, this metal is found in the minerals gypsum and limestone. For 10 points, name this alkaline earth metal found in bones.
Solution:
Science