Question

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 behavioral 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 the cerebrum in non - bird dinosaurs closely related to birds was very large. c birds and non - bird theropod dinosaurs have a hole in their hipbone. d birds and non - bird theropod dinosaurs have hollow bones.

Explanation:

Brooding nests is a behavior. Options B, C, and D describe anatomical (brain - size, hip - bone hole, hollow bones) rather than behavioral similarities.

Answer:

A. Birds brood their nests, just as non - bird theropod dinosaurs did.