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.

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

Banks hold ____ excess reserves and the public holds no currency.
no

Psychology has ____ specific aspects - scientific and professional.
two