객관식
Which of the following occurs during the embryonic period?
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28. Human Development
Embryonic Development (Weeks 3-8)
객관식
Which of these characteristics is shared by both amniotic eggs and placental mammal eggs during embryonic development?
A
Direct nutrient absorption from the mother
B
External fertilization
C
Presence of an amnion
D
Lack of a yolk sac
검증된 단계별 안내1
Understand the concept of amniotic eggs: Amniotic eggs are characterized by the presence of an amnion, a membrane that surrounds the embryo, providing a protective environment.
Recognize the role of the amnion in embryonic development: The amnion is crucial for both amniotic eggs and placental mammal eggs as it creates a fluid-filled cavity that cushions the embryo.
Identify the shared characteristic: Both amniotic eggs and placental mammal eggs have an amnion, which is a key feature in their development.
Differentiate between other characteristics: Direct nutrient absorption from the mother is specific to placental mammals, while external fertilization is not a characteristic of either amniotic or placental mammal eggs.
Clarify the presence of a yolk sac: While amniotic eggs typically have a yolk sac for nutrient supply, placental mammals rely on the placenta for nutrient transfer, making the presence of an amnion the shared characteristic.
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