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.
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Question: 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.

Answer: Science

Question: One character created by this author buys a green hat and green suit and refers to black people as 'hubshi.' The prologue from that collection features a Lebanese furniture-maker who has Hans threaten a tramp aboard a cruise ship. "One out of Many" is from a collection whose title story begins with a Zulu boy rejecting the advances of Bobby, who later drives with Linda through the title location. For 10 points, identify this sexist Trinidadian author of In a Free State and A House for Mr. Biswas.

Answer: Literature

Question: This philosopher discussed the philosophy of science in Our Knowledge of the External World as a Field for Scientific Method in Philosophy. He coined the term logical atomism in a 1911 paper, and in The Ethics of War, he defended wars of principle and wars of colonization. He criticized Alexius Meinong in his essay On Denoting. His other works include a History of Western Philosophy and the essay Why I Am Not a Christian. His namesake paradox debunked the nave set theory of Gottlob Frege. For 10 points, name this philosopher who, with Alfred North Whitehead, wrote Principia Mathematica.

Answer:
Social Science