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: 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.

SOLUTION: Social Science

PROBLEM: This results from phonon interactions in simple metals. Joule heating is caused by this, while Wheatstone bridges are used to find unknown values for this quantity. The thermal form of this quantity is equal to the length of the material over the conductivity times the cross-sectional area. "Drug" this occurs when pathogens become able to survive exposure to certain drugs, rendering those drugs obsolete. Drag is sometimes called this of air. Name this term, the electrical type of which measures of the degree an object opposes the flow of an electrical current, measured in ohms.

SOLUTION: Science

PROBLEM: In one work, he remarks on "the attractive Anglo-Saxon kind of unnecessary originality" of Keynes and Robertson, and in that work suggests that Wicksell had already won freedom from the tyranny of Say's Law and the Quantity Theory of Money. This economist, in one work, compares ex post and ex ante methods of computing savings to help show that the title concept can occur at any level of economic activity, in his Monetary Equilibrium. In a number of related "Crisis Papers" he laid out what policies Ernst Wigforss should implement for his New Economic Policy, and this thinker would describe such policies as "social prophylactics. " He termed wage reform, a "technical trick," and advocated an investment in the number of child-related services, in a work, co-authored with his wife, that attempted to solve the title question that had been developing in his country in previous decades. In addition to Crisis in the Population Question, he engaged in sharp ideological dispute with Ralph Bunche over the central problem in his perhaps best known work, a condensed version of which was published by his associate, Arnold Rose, and was titled Negro in America. For 10 points, name this Swedish Economist author of the two-volume An American Dilemma.

SOLUTION:
Social Science