Science Assessment

Some organisms, such as a chimpanzee and a gorilla, have many similarities.  Others, such as a chicken and an oak tree, have fewer similarities.  What is TRUE about the ancestors of these organisms?

1. Chimpanzees and gorillas share a common ancestor with each other, but chickens and oak trees do not share a common ancestor with each other.
2. Chimpanzees and gorillas share a common ancestor with each other, and chickens and oak trees share a common ancestor with each other, but chimpanzees and gorillas do not share a common ancestor with chickens and oak trees.
3. Because chimpanzees, gorillas, chickens, and oak trees are separate species, none of them shares a common ancestor with any other.
4. Chimpanzees, gorillas, chickens, and oak trees all share an ancient common ancestor.