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How is the yolk sac formed? What is the function of the yolk sac?
The yolk sac is formed from the covering of the vitellus by some cells originated from the primitive gut.
The yolk sac stores vitellus, the main nourishment source of non-placental embryos.
Image Diversity: yolk sac
Q. In which bones can bone marrow chiefly be found? Is the bone marrow made of osseous tissue? Bone marrow can mainly be found in the internal cavities of flat bones, like the
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We now understand that mutations that cause the inhibition of apoptosis are found in tumors. Because proliferation itself is not induced by the inhibition of apoptosis, explain how
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