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jackcampbell77
jackcampbell77 jackcampbell77
  • 13-12-2015
  • Biology
Answered

how does a bird develop without a placenta and is connected to its mothers blood supply?

Verified Answer :

TheCertainer4356
TheCertainer4356 TheCertainer4356
  • 13-12-2015

During embryonic development of a bird special temporary organs are formed within the egg that nourish and protect until hatching occur. In the case of birds, this one such feature is the yolk sac which provides all the nourishing materials that a placenta would supply.

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