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


[Q]: Systems information is ____ dimensional because it varies with time.
[A]: four


[Q]: Animals are classified into ____ different categories by their eating habit.
[A]:
four