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

[Q]: Miniature cattle are classified in _ categories as measured by height at the hip.
[A]: three


[Q]: Most cats have only _ to five toes per paw, depending on whether it is the front or back paw.
[A]: four


[Q]: Hydrocarbons have _ ozone depletion potential, and very low global warming impact.
[A]:
zero