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3.Reproductive Health
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The bio-index number means
A
Natality -Mortality
B
Natality $×$ Mortality
C
Mortality -Natality
D
Natality/Mortality
Solution
(d) The percentage ratio of natality over mortality is known as vital index. $i.e.$ natality/mortality $× 100$. It determines the growth of a population.
Standard 12
Biology
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