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]: Food waste is transformed into soil-like humus in three to ____ days.
[A]: seven


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


[Q]: Insects are different from other arthropods because they have ____ legs and three body regions.
[A]:
six