By definition, an apomorphy is an evolutionary novelty or derived character whereas a plesiomorphy is defined as a preexisting or ancestral character. The evolutionary tree presented here depicts four imaginary birds and their common ancestor. Depending on ones perspective, a character can be considered apomorphic on the one hand, and plesiomorphic on the other. For example, if we are looking at the entire group of 4 birds, the mask is considered plesiomorphic because the common ancestor did not have it. On the other hand, if we are only interested in the subset of masked birds, the mask is considered apomorphic; the common ancestor of these 3 lineages shared the mask..
A. True
B. False