During the Carboniferous era, there were many amphibians; the first reptile evolved from labyrinthodont ancestor. Amniotic egg appears very early in reptilian evolution. Egg has several special ...
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Everything you need to know about fraternal twinsFraternal twins come from two separate fertilized eggs that develop in the womb at the same time, each with their own placenta and amniotic sac. Like any siblings, they may – or may not ...
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