Paleontologist Dr. Reed claims that some early mammals were warm-blooded well before the extinction of the dinosaurs, contrary to the traditional view that mammalian warm-bloodedness arose only after dinosaurs declined.
Which finding, if true, would most strongly support Dr. Reed's claim?
- Acheck_circle
Bone microstructure of early mammal fossils dating to 100 million years ago shows growth patterns characteristic of warm-blooded animals.
- B
Mammals diversified rapidly after the dinosaurs went extinct.
- C
Many modern mammals live in cold climates.
- D
Some dinosaurs are now thought to have been warm-blooded as well.
Explanation
A provides direct fossil evidence dating warm-bloodedness to the dinosaur era. B, C, and D are tangential.