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

[EX Q]: Rats multiply _ times as fast as cats.
[EX A]: four

[EX Q]: Diatoms are in _ shells and make the water brown.
[EX A]: two

[EX Q]: Hallucinations refer to internal stimuli that have _ basis in external reality.
[EX A]:
no