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

[EX Q]: Porcine insulin has _ different amino acid and bovine insulin has three different amino acids.
[EX A]: one

[EX Q]: Sabbats There are usually _ major holy days, or holidays, in the Pagan calendar.
[EX A]: eight

[EX Q]: Some ticks feed on only _ host throughout all three life stages.
[EX A]:
one