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]: Mature birds boast a wing span of ____ feet.
[A]: six


[Q]: Ctenophores have ____ rows of comblike plates arranged longitudinally around the body.
[A]:
eight