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

[Q]: Sodomy is the third major term, and is also defined in _ degrees.
[A]: three

[Q]: Optical isomers differ in the arrangement of _ groups around a chiral carbon.
[A]: four

[Q]: Females give birth every _ to twenty years, and care for the calves for more than a decade.
[A]:
four