Multiple Choice
Which of the following happens during the first trimester of pregnancy?
A) Chemical messages are sent to the brain to start menstruation.
B) A woman can no longer tell if she's pregnant by using a urine test.
C) The cervix thins and begins to stretch.
D) The zygote implants itself in the lining of the uterus.
Correct Answer:
Verified
Correct Answer:
Verified
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