Which of the following statements about taxonomy is NOT true?
A. Homologous structures are derived from a single structure in the ancestor, although they may be adapted to different uses in the descendent species (e.g., a dog's foreleg and a human's arm).
B. In cladistics, a common ancestor and all its descendants that share one or more derived traits are placed in a single clade.
C. Biochemical data and the fossil record can be used independently to indicate the length of time since two species diverged from a common ancestor.
D. Analogous structures are derived from a common ancestral structure to perform the same function.