Answer:
E) oxytocin.
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Because nowadays, many horses are domesticated, and food they would have eaten in the wild, they don't usually eat anymore. They have learnt to adapt to eating other foods, like hay, that require molars to ingest. This is why over time, their tooth structure has changed.
A. Wheat, corn, soybeans, and cabbage are the main four plants responsible for providing food to people in the world.
Color change is the answer because that is a physical change