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

Some of the figures in this painting are seemingly superfluous:  Mercury stands at the far left, dispelling clouds from above trees laden with golden fruit. A Cupid on the wing aims his little bow, but is probably only there by grace of his mother Venus, above whom he hovers. The action takes place on the right. The West Wind, Zephyrus, pursues a virginal Chloris whom he will rape. Chloris is then shown transformed, bedecked with flowers, as the title character. For 10 points, name this Botticelli allegorical work.
Fine Arts

A king orders his subjects to determine what the namesake object is in this man's short story, "A Grain as Big as a Hen's Egg". This author expanded on his first critical success with the collection Childhood: Boyhood and Youth. Another of his stories contains Schwartz and Gerasim, the latter of which is the nurse of the titular deceased character. After the death of Luka, Olenin unsuccessfully proposes to Marianka in his The Cossacks, while one of his most famous novels concerns the Kuragin family and Pierre Bezukhov. For 10 points, identify this Russian author who wrote Anna Karenina and War and Peace.

Literature