The distinguishing characteristic between birds and all other organisms is

the possession of feathers

Explanation:birds are warm blooded animals , that possess feathers.these feathers cover their bodies and used for flight and warmth.their forelimbs are modified into wings,which fold into a Z shape at rest.feathers grow from the skin follicles and are replaced by scales on their legs.they possess oil gland to dress the feathers.

Other features of birds include

1) beaks with no teeth

2) fully ossified bones with air cavities

3)females with left ovary and oviducts only

i would say the prokaryotic cells the prokaryotic cells are less complex, are usually found only in unicellular organisms and have more limited capabilities than eukaryotic cells.

a adaptation is when organism changes itself to fit the environment

ex. when its cold outside i wear a jacket

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