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A chemical change in which structure prevents polyspermy fertilization?
Demography
The statistical study of populations, analyzing structure, distribution, and trends through births, deaths, migrations, and aging.
Developing Countries
Nations with a lower living standard, undeveloped industrial base, and lower Human Development Index relative to other countries.
Life Expectancy
The average number of years a person is expected to live, based on statistical averages.
Crude Death Rate
A measure of the number of deaths in a given population, scaled to the size of that population per unit of time, typically expressed as deaths per 1,000 individuals per year.
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