Birds never developed an internal placental system but are confined to laying eggs.Consider the many physiological burdens and limitations imposed by bearing live young,and then consider all of the adaptations of birds for flight.Given that birds arose from dinosaur-like ancestors that also laid eggs,but birds managed to evolve a high metabolism and other specialized features,discuss one physiological reason that probably limits birds from ever evolving viviparity.

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The Answer of Birds never developed an internal placental system but are confined to laying eggs.Consider the many physiological burdens and limitations imposed by bearing live young,and then consider all of the adaptations of birds for flight.Given that birds arose from dinosaur-like ancestors that also laid eggs,but birds managed to evolve a high metabolism and other specialized features,discuss one physiological reason that probably limits birds from ever evolving viviparity.

Birds Never Developed an Internal Placental System but Are Confined