Without exception,all birds are

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(D) The class $Aves$ is characterized by the presence of feathers,and most of them can fly except for flightless birds like ostriches and penguins. No

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Have calcareous shelled eggs

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(D) The class $Aves$ is characterized by the presence of feathers,and most of them can fly except for flightless birds like ostriches and penguins. Not all birds are omnivorous,and not all birds build nests or exhibit parental care to the same extent. However,all birds are oviparous and lay eggs that are protected by a hard,calcareous shell. Therefore,the presence of calcareous shelled eggs is a universal characteristic of all birds.

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