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

Q: Scientists use a characteristic to classify animals into _ groups.

A: two
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Q: Many prosimians have at least _ nipples and produce litters rather than a single offspring.

A: four
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Q: Homosexual men are _ times more likely to have attempted suicide than are heterosexual men.

A:
six
****