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.

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.
Social Science

Iannis Xenakis used eight so-called "sound complexes" in a solo work for this instrument called Nomos Alpha. Six beats on the body of these instruments begin the main theme in Arvo Part's orchestration of Fratres for twelve of them. An ensemble consisting entirely of these instruments was founded in the 1970s by twelve members of the Berlin Philharmonic. The first of Villa-Lobos's Bachianas Brasileiras was composed for (*) eight of these instruments, while Jacqueline du Pre popularized Edward Elgar's concerto for it. J.S. Bach's six unaccompanied suites for this instrument were famously recorded by both Mstislav Rostropovich and Pablo Casals. For 10 points, name this instrument played by Yo-Yo Ma which joins two violins and a viola in a string quartet.
Fine Arts

A librarian is saved from death via self-caused pneumonia in France, but the arrival of the Baroness leads to their relationship in this authors The Confession of a Fool, while Fredericks mother jumps out the window of the burning house while Frederick and his wife embrace each other at the end of another of his works. This author also wrote about Indras visit to Earth in another work, while Hummel attempts to set up his daughter with the student Arkenholz in another work. This author of The Pelican, A Dream Play, and The Ghost Sonata may be better known for a work about Lauras struggle over how to raise Bertha, as well as one about Jeans relationship with the counts daughter. The author of The Father and Miss Julie, this is, for 10 points, which Swedish dramatist
Literature