Given a sentence, fill out the missing word with a 'no' or a number (between zero and ten). You should write the numbers with english alphabet, like: four instead of 4.

Q: Warthogs also sport ____ sharp tusks.

A: four
****
Q: Spermatogenesis creates ____ sperm of equal size.

A: four
****
Q: Ozone is a unique molecule containing ____ oxygen atoms that form an isosceles open triangle.

A:
three
****