instruction:
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.
question:
Arthropods are made up of ____ groups of living animals and one group of extinct animals.
answer:
four


question:
Compound objects have ____ representations themselves.
answer:
no


question:
Perennials can take three or ____ years to reach a mature size.
answer:

four