Why are birds considered dinosaurs? What characteristics do birds have that non-avian (not a bird) theropod dinosaurs had?

Fossil evidence also demonstrates that birds and dinosaurs shared features such as hollow, pneumatized bones, gastroliths in the digestive system, nest-building and brooding behaviors.

Explanation:

Physical change is a change in state or phase which does not produce a new substance. Physical changes include changing the state of a pure substance between solid, liquid, and gas phases of matter, like melting, freezing, vaporization, condensation, sublimation. The following can occur in a physical change: The particles can arrange in different ways. Correct B All other options are characteristics of a chemical change which results in new substance.

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