The evolution of the eohippus into the modern day horse is an example of metamorphosis.
A character change would be internal, stasis means to remain the same and extinction is the end of an organism, the eohippus is extinct, but the question is asking specifically about it's change. Therefore choice 4 is the correct answer.
Answer:
While a dictionary is not supplied in this question, <em>harrow</em> means to cause distress. hope this helps :)
