There is some evidence that reptiles called cynodonts may have had whisker-like hairs around their mouths. If true, then what can be properly said of hair?
A) It is a shared derived character of mammals, even if cynodonts continue to be classified as reptiles.
B) It is a shared derived character of the amniote clade, and not of the mammal clade.
C) It is a shared ancestral character of the amniote clade, but only if cynodonts are reclassified as mammals.
D) It is a shared derived character of the mammals, but only if cynodonts are reclassified as mammals.
Skin signs are objective evidence of an illness or disorder. They can be seen, measured, or felt.
Endocarditis. The human heart has been sectioned to reveal the left ventricle and origin of the aort
Hierarchy of evidence
In this painting evangelist George Whitefield appears to be cross-eyed. This is no fault of John Wol
Tumor marker analysis of a patient with no evidence of disease monitored for tumor recurrence. The ...
A thin cleft, called the synapse, separates one cell from another.