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Human pregnancy typically lasts weeks and is divided into trimesters. A fetus with XX chromosomes is a while a fetus with XY chromosomes is . A fertilized egg is called a ___ . After it attaches to the uterus wall it is called a . Name the 2 functions of the placenta: Name 2 things that happen during the second trimester: Name 2 things that happen during the third trimester: Increased and help with understanding of safe pregnancies.
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Human pregnancy typically lasts weeks and is divided into trimesters. A fetus with XX chromosomes...
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