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

[EX Q]: Men are creatures with two legs and _ hands.
[EX A]: eight

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

[EX Q]: Crabs have _ legs.
[EX A]:
ten