Fossil evidence indicates that several kinds of flightless dinosaurs possessed feathers. If some of these feather-bearing dinosaurs incubated clutches of eggs in carefully constructed nests, this might be evidence supporting the claim that
A) dinosaurs were as fully endothermal (warm-blooded) as modern birds and mammals.
B) their feathers originally served as insulation, and only later became flight surfaces.
C) the earliest reptiles could fly, and the feathers of flightless dinosaurs were vestigial flight surfaces.
D) the feathers were plucked from the bodies of other adults to provide nest-building materials.
E) all fossils with feathers are actually some kind of bird.
A revised phylogenetic tree of flightless birds.
Mounted fossil of Equus occidentalis from the La Brea Tar Pits
Experimental Evidence for Infrared Radiation
The End of the Dinosaurs
dinosaurs were real
Pulse–chase labeling evidence of bidirectional DNA replication in mammalian chromosomes