a. Pigmented skin
b. Pneumatic bones
c. Viviparity
d. Warm-blooded
A)Correct option -D
B)Explanation for correct option –
●Birds and mammals both have warm blooded animals .
●Both have 4 chambered hearts also.
Birds and mammals share one of the following characteristics as a common feature.
Birds and mammals share one of the following characteristics as a common feature.
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(d) all of these