Scientists suspect that modern horses have different dietary habits than horses that lived long ago. What is the most reliable source that scientists can use to prove that horses have changed over time? A. interviews with veterinarians B. fossil evidence C. cave drawings D. fables

The answer is B

The most reliable way to prove the change of horses over time is B: Fossil evidence. By observing the remains of the ancestors of horses they can bridge the connections between the two to prove and explain any differences due to environmental and genetic differences and maybe perhaps adaptive differences with more research.