<prompt> The age and sex structure of a population may be best described by aLife tablecorelation coefficientPopulation pyramidBar chart  <response>: The age and sex distribution of a population is best represented by population pyramidIn countries with high birth rates as ours, it is broad based conical pyramid because of high birth rate and tapering of population with increase in age.In developed countries with low birth rate, the pyramid swells in the middle and is narrow at the base and is not so conical at the top. dumb bell shaped.Utility of population pyramid Shape of population pyramid indicates fertility patternBroad base, Narrow top upright triangle: High proportion of younger population developing countriesBulge in Middle: High proportion of adults developed countriesSpan height of population pyramid indicates life expectancyTaller pyramid: Higher life expectancy developed countriesShorter pyramid: Lower life expectancy developing countriesSymmetry of population pyramid indicates sex ratioSymmetric pyramid: ideal sex ratio developed countriesAsymmetric pyramid: unfavorable sex ratio 1000 developing countries 