A) The blastocyst is a stage in fetal development that appears early during the third trimester.
B) A vital connection between the fetal and maternal blood supplies occurs at the placenta.
C) Most of the growth in fetal size occurs during the second and third trimesters.
D) All major organ systems have formed by the end of the fetus's first three months of life.
Correct Answer: A
Solution :
[a] The blastocyst is one of the very first stages in human embryonic development, occurring early in the first trimester.
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