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.

When it interacts with ryanodine receptors, this element upregulates its own release, and this compound forms the cell plates of coccolithophores. Stimulation of Gq ("g-sub-q") opens a channel that allows for this ion's movement, and proteins that bind this ion have an EF hand motif. Cellular concentrations of this ion are regulated by IP3. Parafollicular cells of the (*) thyroid produce a compound that reduces the concentration of this ion in blood, and its intestinal absorption requires vitamin D. This ion interacts with Troponin to stimulate muscle contraction, and the lumens of sarcoplasmic reticula have high concentrations of this ion. For 10 points, name this divalent cation that is stored in bones.
Science

Two answers required. They figure prominently in the opening chapter of the book of Malachi, where God reminds the Israelites that he is all-loving and above the law because he chose to save one and destroy the other. One had two concubines, Bilhah and Zilpah, while the others name translated from Hebrew means hairy. With the help of their mother, one tricked the other into giving up his birthright for a bowl of soup to fulfill the prophecy that "the last shall be first". For 10 points, name these twin sons of Rebekah and Isaac, the younger of whom fathered Joseph.
Literature

After lying to another deity with a flower, he was cursed to no longer be worshipped on earth. This god's city is found within the heavens situated atop Mount Meru. After assuming the form of a swan, this figure was attacked after lying about reaching one end of the lingam. This led to him losing one of his five heads, with which he saw in every direction. Using his own substance, he created his consort, Sarasvati. In his four (*) arms, he carries a water jug, a scepter, a bow or spoon, and the Vedas. For 10 points, name this creator god of the Hindu trimurti.

Social Science

