yaseenmk147 yaseenmk147
  • 09-05-2020
  • Biology
contestada

How do birds develop without a placenta?

Respuesta :

afriedow
afriedow afriedow
  • 09-05-2020

Answer:

The tadpoles take their food from the yolk of an egg. The egg yolk is equivalent to the placenta. The placenta attaches itself to the uterus to provide the developing foetus with blood and oxygen

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