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.

Women are ____ times more likely to have bone thinning than men.
four

Female smokers enter menopause an average of ____ years earlier than nonsmokers.
five

Primary succession is succession in an area where ____ previous organisms existed.

no