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What are the animal pole and the vegetal pole of the vertebrate egg?

Answer:

The animal pole of a telolecithal egg is the portion of the egg with little vitellus, it is opposite to the vegetal pole that is the region where the yolk is concentrated.

Image Diversity: animal and vegetal poles

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What are the four initial stages of the embryonic development?	What is the function of the vitellus in the vertebrate egg? How are these eggs classified according to the amount of vitellus within them?