TASK DEFINITION: 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.
PROBLEM: Inversions have the classic double loop at meiosis, and have ____ crossovers when heterozygotes.

SOLUTION: no

PROBLEM: Coastal kelp beds, for example, appear to be three times larger than in the past four or ____ years.

SOLUTION: five

PROBLEM: Most fairy rings are only present for ____ to four or five years and eventually die.

SOLUTION:
one