At which stage is the human embryo most susceptible to toxic substances?
A) During organogenesis
B) Just before birth
C) During the last trimester
D) During cleavage
E) During the fourth and fifth months
Correct Answer:
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Q19: is the developmental event that results in
Q20: The metamorphosis of a caterpillar into a
Q21: In the 1920s, two German embryologists, Hans
Q22: During mammalian development, a
A) morula becomes gastrula.
B)
Q23: At what stage does a human embryo
Q25: A human embryo is known as a
Q26: What will occur if a morula divides
Q27: Based on experiments with amphibian embryos, Spemann
Q28: In humans, implantation occurs
A) when the embryo
Q29: Induction refers to
A) the formation of the
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