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

Q: Flatworms exhibit _ forms of life styles, free-living and parasitic.

A: two
****
Q: Muskrats are semi-aquatic and prefer locations with four to _ feet of water.

A: six
****
Q: Pups hatch inside the mother and are over _ feet long when they emerge.

A:
four
****