Science Assessment

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

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