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     EduGorilla 
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    Which of the following are the characteristics of Aves?

    1. Forelimbs are modified into wings.
    2. Respiration is not through lungs.
    3. Heart is four-chambered.
    4. They lay eggs.

    Options :-

    1. Only 1 and 2
    2. Only 1, 3 and 4
    3. Only 2 and 4
    4. Only 1, 2 and 4
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Reply To: Which of the following are the characteristics of Aves?1. Forelimbs are modified into wings.2. Respi….
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