Which prefix means 'two'

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Multiple Choice

Which prefix means 'two'

Explanation:
The idea being tested is how prefixes convey quantity, specifically the meaning of two. The prefix that means two is bi-, which appears in words like bicycle (two wheels), binary (composed of two parts), and bilingual (speaking two languages). The other prefixes have different meanings: de- indicates removal or reversal, extra- means beyond or outside, and deca- means ten. So the best answer is the prefix that signals two: bi-.

The idea being tested is how prefixes convey quantity, specifically the meaning of two. The prefix that means two is bi-, which appears in words like bicycle (two wheels), binary (composed of two parts), and bilingual (speaking two languages). The other prefixes have different meanings: de- indicates removal or reversal, extra- means beyond or outside, and deca- means ten. So the best answer is the prefix that signals two: bi-.

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