The bio-index number means

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(D) The bio-index number,also known as the vital index,is defined as the ratio of natality (birth rate) to mortality (death rate).It is calculated as:

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Natality / Mortality

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(D) The bio-index number,also known as the vital index,is defined as the ratio of natality (birth rate) to mortality (death rate).It is calculated as: $	ext{Vital Index} = \frac{	ext{Natality}}{	ext{Mortality}} 	imes 100$.This index is used to determine the growth potential of a population. If the value is greater than $100$,the population is increasing; if it is less than $100$,the population is decreasing.

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