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3. Read this sentence from the text.
"Based on the evidence of shared characteristics, scientists have concluded that birds
are a type of theropod dinosaur."
What is a piece of skeletal evidence that supports the conclusion that birds are a type of theropod dinosaur?
A. Birds brood their nests, just as non-bird theropod dinosaurs did.
B. Feathers may have been used by non-bird dinosaurs in some of the ways that birds use their feathers today.
C. The cerebrum in non-bird dinosaurs closely related to birds was very large. D. Birds and non-bird theropod dinosaurs have a hole in their hipbone.

All theropod dinosaurs, including birds, have a furcula, also known as a wishbone. Another shared characteristic is the presence of hollow bones. Hollow bones reduce the weight carried by an animal. This feature enables the animal to run faster.

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