structure bird egg embryo |
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| navigate by keyword : air albumen allantoic amnion amniotic bird chalaza cheeper chick chicken covering crust developing egg embryo fertilized flapper hard liquid membrane nestling poult protecting shell space squeaker squealer substance vitellus white yolk youngling |
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| scheme egg. Interior view of a bird's egg. Porous shell enclosing an embryo and the substances that nourish it during incubation. Animal biology. Structure egg |
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