At two points close together toward the upper right of the diagram, since X and Y chromosomes are more advanced.
That will be c) the third one
Answer:
fish and tetrapods are both vertebrates that have a backbone with a spinal cord. fish lived before tetrapods because their fossils are in rocks over 500 million years old.
Explanation:
fish and tetrapods are both vertebrates that have a backbone with a spinal cord
