Which era could be called the "age of mammals and birds " ?

Which era could be called the "age of mammals and birds " ?
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Which era could be called the "age of mammals and birds " ? A. Mesozoic B. Palaeozoic C. Cenozoic D. Creataceous
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Description : Birds and Mammals have `:-`

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Description : Evolution of birds and mammals occurred in :

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Description : What is the main organs in keeping water balance in mammals and birds?

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Description : What are the similarities between mammals and birds and mammals?

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Description : Classify the following animals are reptiles, mammals, birds and fish.

Last Answer : a) Blue whale----Mammals b) Cobra--------Reptile c) Panda--------Mammal d) Ostrich-------Bird e) Penguin------Bird f) Kiwi----------Bird g) Shark--------Fish h) Alligator -----Reptile i) Dolphin-------Mammal j) Tortoise------Reptile

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Description : The circulatory systems of birds and mammals are considered to be more efficient. Why? 

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Description : Two examples in which the nitrogenous wastes are excreted from body in the form of uric acid are (a) birds and lizards (b) frogs and cartilaginous fish (c) insects and bony fish (d) mammals and molluscs.

Last Answer : (a) birds and lizards

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Which one of the following characteristics is not shared by birds and mammals? (a) Viviparity (b) Warm blooded nature (c) Ossified endoskeleton (d) Breathing using lungs

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If you had a choice on what era you could live in, what would it be and where?

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