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]: Arthropods are made up of ____ groups of living animals and one group of extinct animals.
[A]: four


[Q]: Neutrinos are particles with almost ____ mass and no electric charge.
[A]: no


[Q]: Snails can penetrate a shell as thick as ____ millimeters.
[A]:
five