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

Q: Diatoms look like _ shells that fit together.

A: two
****
Q: Lobsters have _ walking legs and two legs bearing claws.

A: eight
****
Q: Hereditary hair thinning is a normal, common part of life for _ out of every four women .

A:
one
****