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Home Q & A Board Science-Related Homework Help High School Level Science
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lindsaym lindsaym
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12 years ago
Occasionally, a developing embryo becomes implanted outside the uterus, such as in the Fallopian tube, an ovary, the cervix, or another organ in the abdominal cavity. One reason such a pregnancy is unsuccessful is that
   
a) adequate structures do not develop to transfer materials between the maternal and embryonic blood
b) the outer cells of the embryo attach to the endometrium to form the placenta, which degenerates
c) ovarian production of progesterone ceases and the placenta degenerates
d) FSH production ceases and the corpus luteum degenerates
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colleencolleen
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12 years ago
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4 years ago
this
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3 years ago
Nice
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