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

[EX Q]: Porphyritic textures form primarily because of _ rates of cooling.
[EX A]: two

[EX Q]: Meerkats can have one to seven babies at _ time.
[EX A]: one

[EX Q]: Rotary engines produce _ power pulses per crankshaft revolution.
[EX A]:
three