Name two features found in birds and their role in ensuring the ability to fly

There two features which facilitates bird to fly are presence of light and smooth feathers and light bones.

Birds are the only living creatures which has the ability to migrate from one place to another through flying. There are many physical features present in their body which facilitates them in flying.

Among the two features and their role in flying are as follows:  

the "power" of a lens is its resolution power, or its ability to distinguish between to closely located points. with the low power lens, it is likely you will see the rough form of the hay and maybe some movement of dots around the hay. however, when observed with the high power lens, the detailed features of the hay become visible and the microbes being grown are more clearly visible.

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