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

[EX Q]: Smokers die an average of six to _ years earlier than nonsmokers.
[EX A]: eight

[EX Q]: Sturgeons are shark-like in form but are unique in having _ rows of bony plates along the body.
[EX A]: five

[EX Q]: Mitosis occurs in _ phases, called prophase, metaphase, anaphase, and telophase.
[EX A]:
four