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

[EX Q]: Microsporophylls bear two to _ microsporangia.
[EX A]: eight

[EX Q]: Titanium is found in column _ along with chemically similar zirconium, hafnium, and thorium.
[EX A]: four

[EX Q]: Smoking is responsible for _ in five deaths in the United States.
[EX A]:
one