Reproduction in birds
Explain how the reproduction is carried out in the birds ?
Expert
Birds, too have sexual reproduction just like every vertebrate. Their embryos are developed within the shelled eggs containing extra embryonic membranes and outside the body of mother .Birds copulate. Fecundation is internal and it happens only before the female gamete is involved by the calcareous eggshell.
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State some of the tissues which form the skin in the vertebrates?
Give a brief description of vitamins? And also write down the main vitamins needed by humans?
In the scientific competition against the fixism write down the major arguments which favor evolutionism?
What is the fluid which fills the nucleus termed?
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Explain why does the bark often die and break naturally?
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