What stage happens 3-4 days after fertilization? 
A) A
B) B
C) C
D) D
E) E
Correct Answer:
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Q20: In infants this connects the umbilical vein
Q22: What stage happens 6 days after fertilization?
Q23: What is line "G" pointing to?
Q26: Which one represents the blastocyst stage?
Q28: What does diagram "A" represent? 
Q29: This was formerly called the blastocyst cavity.
Q30: These cells are derived from the yolk
Q34: If one parent has type A blood
Q37: Chromosome #15 is considered
A)A sex chromosome
B)An autosome
C)The
Q39: When phenotype can be drastically different depending
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