How a girl becomes pregnant ?​

by sex

Explanation:

Pregnancy happens when a man's sperm fertilises a woman's egg, which can happen even if you've not had sexual intercourse (penetration). During sex, semen is ejaculated from the man's penis into the woman's vagina.

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answer: land bridge theory. land bridge theory held that shifting portions of dry land explained the finding of identical species on different continents. plate tectonic theory eventually eliminated the land bridge theory.