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.
Fossil from the Carboniferous period
Model for evidence-based clinical decision making.
Fossil fuels production
The evidence of metabolites from gut microbiota.
Did birds evolve from dinosaurs?
Experimental evidence that signals from dorsal lip cells initiate amphibian gastrulation. A dorsal l