Question: A scientist studies the remains of two extinct animals to learn more about how they lived. She determines that one animal was a carnivore and the other was an herbivore. Which of the following did the scientist most likely compare to make this conclusion?

  Options: 
 A. the number of bones in the animals
 B. the size of the animals
 C. the body covering of the animals
 D. the skull of the animals
Answer: D