Respuesta :

It's simple

when 2 people marry , they have kids

those kids have their kids

then their kids and so on

so population increases

more detailed

Since most fertility occurs in marriage, a rise in the age of marriage can reduce world fertility. ... Later marriage means less female fertility exposed to intercourse, which can particularly affect already subfecund women. The number of women in professions and careers also dampens fertility rates.

Marriage plays a huge part in a persons life giving them someone to love and live with. often people who get married have kids which adds one or more people to this world. often those kids get married and have kids of there own.
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