Question

5 what is the main idea of this text? a the behavior of animals that have been extinct for a long time cannot be observed, and their dna has been destroyed. b feathers were once thought to have evolved for flight, but now scientists think feathers may have originally served other purposes. c skeletal and behavioral evidence show that birds are dinosaurs, and brain evidence supports this conclusion. d scientists are using technology to reconstruct the inside of fossilized skulls and learn more about dinosaur brains.

Explanation:

Without the actual text, we can't be certain, but options A - D cover various scientific - related topics. Option A is about extinct animals' limitations in study, B is about feather evolution, C is about bird - dinosaur relationships, and D is about dinosaur brain research. Assuming the text discusses the connection between birds and dinosaurs from multiple evidence aspects, C seems most comprehensive.

Answer:

C. Skeletal and behavioral evidence show that birds are dinosaurs, and brain evidence supports this conclusion.