TASK DEFINITION: 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 simplicity, answers should be in all lower cased letters.
PROBLEM: Category: HANNA-BARBERA DOGS 
Clue: In one episode of the original "Jetsons", a millionaire tried to take him away

SOLUTION: astro

PROBLEM: Category: MILITARY TRAINING BASES 
Clue: Service branch with a San Diego recruit depot & a Yuma air station

SOLUTION: marines

PROBLEM: Category: PLACES FOR ANIMALS 
Clue: Over 1,500 species of worm are named for this habitat

SOLUTION:
the earth