A blastocyst is a hollow ball of cells,while the morula is a solid ball of cells.
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Q22: A pregnant woman urinates more often than
Q23: By 72 hours after fertilization,the egg has
Q24: The placenta and its attached fetal membranes
Q25: The embryo is directly enclosed in and
Q26: In fetal circulation,one way in which blood
Q28: A zygote is usually formed within the
Q29: Surfactant production in premature infants is rarely
Q30: Of the three germ layers,the mesoderm forms
Q31: The embryonic period lasts until the end
Q32: Fertilization occurs while the egg is still
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