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.

Most babies double their birthweight by ____ to five months.
four

Inversions have the classic double loop at meiosis, and have ____ crossovers when heterozygotes.
no

Frostbite comes in ____ levels of severity or degrees.

three