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]: Light drives the interconversion of ____ forms of phytochroms.
[A]: two


[Q]: Sponges have ____ main tissue layers.
[A]: three


[Q]: Dingoes live to five or ____ years of age in the wild and fifteen years in captivity.
[A]:
six