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

[EX Q]: Bifocal lenses have _ distinct segments with different powers.
[EX A]: two

[EX Q]: Oceanographers now understand the oceanic circulation much better than _ years ago.
[EX A]: ten

[EX Q]: Science is organized into _ units in which inquiry and discovery are the focus.
[EX A]:
five