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

[Q]: Prokaryotes mean they have _ nucleus in which they store genetic material.
[A]: no


[Q]: Humans seem to be able to sense at least _ forms of energy.
[A]: eight


[Q]: Elephants have _ molars, which are replaced five times, for a total of six sets in a lifetime.
[A]:
four