In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.

Q: All dogs are animals, and no cats are dogs, therefore _ cats are animals.

A: no
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Q: Muskrats are semi-aquatic and prefer locations with four to _ feet of water.

A: six
****
Q: Ozone is a chemically unstable molecule composed of _ oxygen atoms.

A:
three
****