Respuesta :
Answer:
Well maybe most of the ancient horses died becuse of how small they were and had to evolve to survive and live longer. Probably.
Explanation:
Answer:I think the environment has changed because there were fossilized tree trunks found with it so that means that there used to be trees in the grassland areas. Maybe the horses were too small so they died or they didn't have enough food to survive off of.
Explanation: