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

[EX Q]: Humans have _ sides to their brain functions.
[EX A]: two

[EX Q]: Most intestinal worms take _ to four weeks for maturation from their larval stages into adults.
[EX A]: three

[EX Q]: Abalone are marine mollusks, with _ species inhabiting the west coast of North America.
[EX A]:
eight