The umbilical cord
A) appears as a tiny stalk and eventually grows to a length of 6 to 12 inches.
B) contains one large artery that delivers nutrients to the embryo.
C) connects the placenta to the developing organism.
D) permits the blood of the mother and the embryo to mix directly.
Correct Answer:
Verified
Q3: At the beginning of the period of
Q4: The _ folds over to form the
Q5: The _ eventually becomes the muscles,skeleton,circulatory system,and
Q6: The male produces an average of _
Q7: The outer ring of cells on a
Q9: The _ produces blood cells until the
Q11: Following fertilization,a one-celled _ multiplies and forms
Q12: The spot on the ovary from which
Q13: The amniotic fluid
A)delivers food and oxygen to
Q38: The amnion
A) develops into the nervous system
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