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.

Neuroblasts delaminate in five waves spanning approximately ____ hours.
three

Elderberry supplements seem to have few risks when used daily for up to ____ days.
five

Moths are most active during the first three to ____ hours of darkness.

five