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.

Sponges have ____ main tissue layers.
three

Penile cancer occurs almost exclusively in the uncircumcised male at a rate of ____ per million.
eight

Seeds are easy to germinate and produce plants that flower in ____ years.

three