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.
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Question: Category: BIRDS 
Clue: The willow ptarmigan, which makes its home in Arctic areas, is this state's official bird

Answer: alaska


Question: Category: SCIENCE & NATURE 
Clue: Developed by astronomer A.E. Douglass, dendrochronology determines age in this way

Answer: counting tree rings


Question: Category: FAMILIAR PHRASES 
Clue: You may "put" this "on the line" or "where your mouth is"

Answer:
money