Wings, hollow bones, and feathers.
its just how the bird is and some of its characteristics but this question was very poorly worded
Living things share all of the following characteristics except _____.
production of light
A boundary membrane
Genitals
They contain cytoplasm.
its a bird
Feathers are a structure that are common to all species of bird. Most feathers are very similar in structure, although they vary depending on how and where the bird lives.
I'm not sure if you mean their common characteristics, or characteristics that they have in common. Some common characteristics are that they have exoskeletons and they are segmented. However, they also have some characteristics that they have in common, and some which no other animals have. One of these characteristics is that they possess biramous appendages, which means legs and other appendages which are forked into two pieces, although some crustaceans lose the minor piece of some legs as they mature. The seoncd thing they all have in common is that all of them first pass through a nauplius larval stage.
They all have eyes.
They all have 'a' for an article. ;D
They are all united and run by their own government.