In earlier eras, the "rabbit test" for whether a woman is pregnant worked due to the presence of ________ in a pregnant woman's urine.

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The "rabbit test" was used in the early 1900s to test for pregnancy by injecting a woman's urine into a female rabbit and then observing the rabbit's ovaries for signs of early pregnancy. This test worked due to the presence of human chorionic gonadotropin (hCG) in a pregnant woman's urine. hCG is a hormone that is produced by the placenta after a fertilized egg implants in the uterus. Today, there are more efficient and humane ways to test for pregnancy, such as using a urine or blood test to detect hCG levels.

In Earlier Eras, the "Rabbit Test" for Whether a Woman