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.

This Vermont native's political positions included head of House and then Senate committees on territories, in which capacity he gave a speech telling opponents of expansion that "you cannot fetter the limbs of this young giant. " His support for expansion led him to favor repeal of the Missouri Compromise and he answered the Dred Scott decision by supporting popular sovereignty in what became known as the Freeport Doctrine. For 10 points, name this man who ran for president against John Bell, John C. Breckenridge and Abraham Lincoln, against the last of whom he had held a famous series of debates in Illinois.
History

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

The title character in one of this author's plays transforms from an old woman to a young girl when Michael Gillane abandons Delia Cahel to fight for her. This author of Cathleen Ni Houlihan laments that(*) "a terrible beauty is born" in one poem. One of his poems tells of leaving a place that "is no country for old men", while another asks "What rough beast... slouches towards Bethlehem to be born". For 10 points, name this Irish author of "Easter, 1916", "Sailing to Byzantium", and "The Second Coming."

Literature