You don't need to be an ass, every post you try to prove your "intelligence" by coming up with some horribly worded post that no-one cares to read. Please stop. And no, every egg is not exactly the same, different animals have different conditions. What you are saying is that even seeds (Yes they are eggs!) are exactly the same as a snake or chicken egg. Stop showing off how little you know about anything.
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Are you seriously incompetent? The eggs are designed that way, to survive, a chicken egg is not. If the egg would be completely fine on its own then evolution (or god) wouldn't have put the instinct in the chickens brain to incubate them. And shark eggs are way different than any other egg on this planet.