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Yolk vs Placenta etc.
Posted: Posted January 12th by chiarizio
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Many plants’ seeds have endosperm, and many animals’ eggs have yolks.
Many animals and plants have placentas.
Do any have both?

Placental mammals and marsupial mammals don’t lay eggs.
Monotreme mammals’ eggs and marsupial mammals’ “eggs” do have yolks. https://en.m.wikipedia.org/wiki/Egg#Mammalian_eggs
From https://en.m.wikipedia.org/wiki/Ovule#Zygote,_embryo_and_endosperm if I understood it right, some angiosperm plants do have both endosperms and placentas. I’m surprised. The only plant I’m familiar with that has placentas is the watermelon. I can’t find it again but I saw something to suggest that maize has both endosperms and placentas; which if true is a surprise to me. There seems to be a kind of curare berry that has both, but I wouldn’t want to eat one of those.

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