As recently as 2007, researchers found evidence of , that was/were shared by chickens and Tyrannosaurus rex.
A. amino acids in the collagen proteins
B. brain structures in the skulls
C. gene sequences on chromosomes
D. 35 body features
E. None of the answer choices is correct.
A. amino acids in the collagen proteins
You might also like to view...
Which extraembryonic membrane accumulates fetal urine?
A) chorion B) yolk sac C) allantois D) amnion
Scientists use mitochondrial DNA to track the migration of humans across the planet. After a group migrates away from their ancestral homeland, any mutations that occur are not mixed with those left in the ancestral population. Therefore, mitochondrial DNA samples taken from ____ would have the fewest unique mutations, representing the original and oldest DNA sequences.
A. Asia B. Australia C. Europe D. Africa E. the Americas
Cheetahs have been through a genetic bottleneck; evidence for this is that
A. little natural selection occurs in this species. B. they originally came from small areas of Africa. C. these cats are members of an endangered species. D. the body is long, thin, and graceful. E. there is very little genetic variability.
Although diversity of communities is affected by processes acting on the local level, it is also directly related to regional rates of species production and immigration.
a. true b. false