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Not all do. I knew a girl (admittedly not bright), who went to the emergency room because she thought that she could feel something moving inside her. Turned out there was...she was well into a pregnancy."Humans", never laid eggs. However, if you go way back to "pre-human" primitive life forms, you would find egg layers. However, if you really believe in Adam and Eve... The "placenta" inside an egg shell encompasses the entire inside of the egg except for the "big" end of the egg wherein lies an air space. When the chick is about to hatch, it pokes it beak through the membrane separating the egg chamber from the air space, and chips away at its circumference (all the way around the air space which has enlarged during the incubation period), until it breaks away. It then struggles to exit the shell through that opening. Misguided, would-be helpers often make the mistake of trying to "help" the chick exit the egg and break away the shell which tears the membrane causing a few drops of blood to leak from it (remember, it is its placenta), and subsequently causing the chick to die from blood loss. It is quite a fascinating process.
Not all do. I knew a girl (admittedly not bright), who went to the emergency room because she thought that she could feel something moving inside her. Turned out there was...she was well into a pregnancy.
"Humans", never laid eggs. However, if you go way back to "pre-human" primitive life forms, you would find egg layers. However, if you really believe in Adam and Eve...
The "placenta" inside an egg shell encompasses the entire inside of the egg except for the "big" end of the egg wherein lies an air space. When the chick is about to hatch, it pokes it beak through the membrane separating the egg chamber from the air space, and chips away at its circumference (all the way around the air space which has enlarged during the incubation period), until it breaks away. It then struggles to exit the shell through that opening. Misguided, would-be helpers often make the mistake of trying to "help" the chick exit the egg and break away the shell which tears the membrane causing a few drops of blood to leak from it (remember, it is its placenta), and subsequently causing the chick to die from blood loss. It is quite a fascinating process.
