Answers

2015-09-01T22:23:00+05:30
Mammals give birth to live young ones,while aves lay eggs

also mammals have mammary glands but aves dont .mammals have four legs aves have 2
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2015-09-02T22:21:30+05:30
Aves have feathers , they are cold blooded , they lay eggs., their limbs are modified as wings.
mammalia have hairs on their skin, they are warm blooded and gave birth to young ones.
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