The lineage that produced chimpanzees and humans split from other primates roughly 30 million years ago. Chimpanzees' skulls have the following features: Trait A, found in fossils as old as 10 to 12 million years, is molars with thick enamel. Trait B, found in fossils as old as 55 million years, is a postorbital wall that ventrally separates the orbit from the temporal fossa. Which of the following statements is TRUE? a. Trait A is more beneficial for chimpanzee survival because it is newer.
b. Trait B is more beneficial for chimpanzee survival because it is older.
c. Trait Ais more likely to be widespread among other primate species because it is newer.
d. Tralt is more likely to bo widespread among other primato species because it is older.