blastulation in vertebrates
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Blastulation is the process by which the cells of zygote divides fast to form a mass of cells called blastula. In is an early stage of development in human embryo
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Vertebrates include amphibians, reptiles, mammals, and birds, as well as the jawless fishes, bony fishes, sharks, and rays. More than 64,000 species of vertebrates have been described, but the extant vertebrate species represent only a small portion of all the vertebrates that have existed.
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