TASK DEFINITION: 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: Seas of calcite predominate during times of low concentration of this element. The NIMS probe discovered that Ganymede has a sulfate of this element, which is also used to treat eclampsia. Its molten form is used to make metallic titanium in the Kroll process. The active site of rubisco contains a carbamylated lysine attached to an ion of this element. Its cationic form is used to stabilize the product of PCR, and it is also prevalent in certain reagents in a Schlenck equilibrium. It is found in Grignard reagents as well as coordinated to the porphyrin ring of chlorophyll. For 10 points, name this element with atomic number 12 and symbol Mg.

SOLUTION: Science

PROBLEM: In one myth, this god fails in his attempts to court his wife until he seduces her in the guise of a cuckoo. He tricks another of his lovers into turning into a fly, then swallows her, only to find out that she was pregnant and that his daughter is causing him a massive headache. In another myth, this god draws lots with his brothers to see who controls the sky, the sea, and the underworld after he castrates and overthrows his father Cronus. For 10 points, name this philandering leader of the Greek gods who is married to the jealous Hera.

SOLUTION: Social Science

PROBLEM: The Kidd glycoproteins present on their surface act as urea transporters. Spectrin and ankyrin are found in the cytoskeletal network of these cells and antibodies on their surface are detected by the direct Coombs test. They express high levels of CD47, which prevents phagocytosis by macrophages in the spleen, and kidneys release EPO which stimulate the production of these. Excess production of them results in polycythemia, and their count is depressed in anemia. Produced in the bone marrow, they are biconcave and lack nuclei. For 10 points, identify these cells that contain hemoglobin, and help transport oxygen to tissues.

SOLUTION:
Science