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

[Q]: Men produce brand new sperm every _ to three months.
[A]: two


[Q]: Climatic regions Contrasts between the interior and the coasts produce _ main climatic regions.
[A]: six


[Q]: Achondrites are rocky, with _ glass spherules, and resemble Earth lavas.
[A]:
no