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Question

Number of females per 1000 males in the population is called _______.

A
Birth rate.
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B
Death rate.
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C
Growth rate.
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D
Sex ratio.
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Solution

The correct option is D Sex ratio.
Number of females per 1000 males in the population is called sex ratio.
The sex ratio is the ratio of males to females in a population. In most sexually reproducing species, the ratio tends to be 1:1. This tendency is explained by Fisher's principle. For various reasons, however, many species deviate from anything like an even sex ratio, either periodically or permanently.

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