Plural is not necessary. "life" will do. I have another question NL888 each is critical to the improvement Is it "to the improvement" or "for the improvement"?
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NL888each is critical to the improvementIs it "to the improvement" or "for the improvement"? I think the appropriate word is "for".
NL888Should "lives of everyone" be "life of everyone"?No. Where there is no ambiguity, good style asks for singular + singular and plural + plural.
Ravi KanthPlural is not necessary. "life" will do.Not really; see my note above.
Ravi KanthIs it "to the improvement" or "for the improvement"?'Critical to' is a standard collocation. 'For' is also used.