Placental

... and dolphins- too, have parasitic fishes in their slits), in order to live and feed there? How have they erased parent species? It is known placental mammals feed through their navel cord. The mentioned parasites got attached to it and they sucked food saps. And when the navel cord got disintegrated, ...

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oh no i am talking about a placental animal, but it (food and oxygen) would pass through (from outside the body) to reach a cell in a egg. the process it goes to. like for example (this is totally false btw): we swallow oxygen through ...

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If the zygote is not from a placental mammal, then it is the egg yolk that supplies the nutrients to the fertilized egg. But actually nutrients for the zygote is all contained in the fertilized egg cell till the blastocyst stage (the cell ...

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... the complement activation), IgG and it subclasses ( acts in Fc receptor-dependent phagocyte responses, complement activation, neonatal immunity or placental transfer), IgE (acts in immunity against helminthes (worms), mast cell degranulation or immediate hypersensitivity) and IgA (acts in mucosal ...

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... may have helped diversity, but it's not the distinguishing characteristic of the group. Asking why they showed up late is kind of like asking why placental mammals showed up late - they couldn't "show up" until the right trail of mutations led to their style of reproduction, but the ...

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