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(C) Robert May,a renowned ecologist,provided a global estimate of species diversity. According to his estimates,the total number of species on Earth i

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$22$

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(C) Robert May,a renowned ecologist,provided a global estimate of species diversity. According to his estimates,the total number of species on Earth is about $7$ million. However,only about $1.5$ million species have been scientifically described and named so far. Therefore,the percentage of species discovered is approximately $(1.5 / 7) 	imes 100 \approx 21.4 \%$,which is commonly rounded to $22 \%$ in $NCERT$ textbooks.

According to Robert May's global estimates,what percentage of the total species on Earth has been discovered so far (in $\%$)?

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