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.
Wood first appeared in plants called progymnosperms.
Earth’s history is divided into nested sets of time--eons, eras, periods, and epochs--and is called
Herbert Spencer (1820–1903), sometimes called the second founder of sociology, coined the term ...
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Foundations of evidence-based practice.
Evidence of early bipedalism