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:
Zygospores result from the fusion of ____ similar hyphal elements.
answer:
two


question:
Tall fescue produces the ____ diazaphenanthrene alkaloids, perlolidone and perloline.
answer:
two


question:
Copper has ____ stable isotopes.
answer:

two