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My understanding is that eggs and no-eggs are not as different as might be expected. After all, the no-eggs still have eggs but, just, don't lay the eggs or le
by graycat 4y ago
My understanding is that eggs and no-eggs are not as different as might be expected. After all, the no-eggs still have eggs but, just, don't lay the eggs or let us make French toast, custards, or omelets! Maybe a key issue would be the amazing placenta. But maybe the egg animals are not so far from having a placenta because they still DO have to be willing to accept the male sperm without killing it, and part of what is amazing about a placenta is that it lets the foreign tissue of the baby exist and thrive in the womb of the mother without destroying it as foreign tissue -- in part, tolerating the sperm, the egg animals already have to do that. These are some details the hookup culture will want to use as sources of conversation? Maybe?
- selimthegrim 4y agoHookup culture and milt are probably not a match waiting to be made in (seven minute underwater) heaven.
- mirekrusin 4y agoYes, that's different subject on how egg, roe and womb is really the same kind of thing. What was striking to me was how far in ancestry chain you have to go back with rhinos to meet common ancestor with egg-lying triceratops - this ancestor will not look like any of them, however they did meet from completely divergent dna to be so look alike, crazy.
- graycat 4y agoYup, maybe that looking alike is called convergence. Apparently a big instance is eyes, apparently developed several times with surprisingly close to the same design. Pigs, rhinos, hippos, ..., triceratops all look much the same to me! Hmm ...? Would the real test of sameness be to see if they make similar BBQ???