The first step of the process of differentiation is the separation of the inner cell mass into two layers, the ____________ and the ____________.
A) endoderm; mesoderm
B) endoderm; ectoderm
C) mesoderm; ectoderm
D) mesoderm; placenta
Correct Answer:
Verified
Q16: Heterochrony refers to:
A) the developing organism's change
Q17: Approximately what percentage of pregnancies end before
Q18: During cleavage, cells do not all divide
Q19: The first week of prenatal development after
Q20: Variability in the levels of development of
Q22: The _ period lasts for approximately 6
Q23: A cell's environment provides information that regulates
Q24: The umbilical cord:
A) connects the embryo or
Q25: Which of the following develop from the
Q26: What is the primary function of the
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