In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.

[EX Q]: Unipolar motors have _ coils and are likely to have five or six wires attached.
[EX A]: four

[EX Q]: Electric vehicles have _ tailpipe emissions.
[EX A]: zero

[EX Q]: Polymorphism occurs in all species and the mandibles bear _ teeth.
[EX A]:
four