You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For consistency, answers should be in all lower cased letters.

Category: BUSINESS & INDUSTRY 
Clue: This package delivery firm was founded in 1907 as the American Messenger Company
ups

Category: ANIMALS 
Clue: Types of this aquatic creature include chimney, sheep's wool, and common bath
the sponge

Category: WORLD HISTORY 
Clue: In 1740 he became king of Prussia & elector of Brandenburg

frederick the great