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: Some species live for as little as ____ months.

A: six
****
Q: Most bacteria have one or ____ circular chromosomes.

A: two
****
Q: Sexual reproduction requires the presence of ____ mating types.

A:
two
****