Which part of a bird's body is not likely to be preserved as a fossil?

Skin, basically everything except the bones are not likely to be preserved

The inside of the bird like the guts and the heart and just everything inside the bird it will rot away and the flesh and feathers and everything but bones and maybe the beak sometimes it remains

Hope This Helps

3. i would say one, but one is not prime nor composite.

Dependent variable;