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.

[Q]: One member of this phylum, Strongylocentrotus purpuratus, is often used to study developmental processes, and another, Pisaster ochraceus, is an example of a keystone species. Most members of this phylum have pedicellariae that possess three jaws, and some have a chewing apparatus known as Aristotle's lantern. Members of class Asteroidea of this phylum have an ambulacral groove, and the madreporite is the entrance to their water vascular system that includes tube feet. FTP name this phylum whose "spiny skinned" members have radial symmetry and include sand dollars, sea urchins, and sea stars.
[A]: Social Science


[Q]: 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.
[A]: Social Science


[Q]: Walsh calculated this quantity by considering stretching force constants, while Philips used dielectric values to calculate it for diamond-like crystals. Allen utilized the configuration energy to find it, while Huggins proposed an alternative to the (*) original thermal chemical method. Martynov and Batsanov determined it by averaging successive ionization energies while Sanderson measured electron density to determine it. Both Gordy and Allred-Rochow made use of the covalent radius and the effective nuclear charge, while Mulliken utilized the ionization potential and the electron affinity. For 10 points, name this chemical property whose most commonly used definition is the one developed by Linus Pauling, which assigns the highest value for this property to fluorine.
[A]:
Science