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Phantasy [73]
3 years ago
7

The ______ becomes the placenta. a. yolk sac b. chorion c. amnion d. allantois

Biology
1 answer:
LekaFEV [45]3 years ago
3 0
I think the correct answer would be A. The yolk sac becomes the placenta. It is membranous sac that is attached to the embryo. It provides all the nutrition and the blood cells needed by the embryo. It is also called the umbilical vesicle.
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Vikki [24]

Answer:

<em>What role did endosymbiosis play in the evolution of eukaryotes? Endosymbiosis led to the evolution of eukaryotic cells with mitochondria and chloroplasts.  This kind of natural selection led to the evolution of eukaryotic cells and the plants and animals we see today.</em>

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<em>Endosymbiosis is important because it is a theory that explains the origin of chloroplast and mitochondria. It is also a theory that explains how eukaryotic cells came to be. DNA, RNA, Ribosomes and Protein Synthesis </em>

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<em>This provided the first substantial evidence for the endosymbiotic hypothesis. It was also determined that mitochondria and chloroplasts divide independently of the cell they live in.</em>

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Question 14
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