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.
Homologous structure are body parts that are similar to each other. They are almost the same, but not quite. That's how the meanings are similar.
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reversed peristaltic action of the intestines, by which their contents are carried upward.
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The preservation of biodiversity provides a vital link to critically expand the molecular diversity necessary for successful drug discovery efforts in the future. ... This ongoing loss of biodiversity is altering ecosystem functions and the ability to provide goods and services for human health and well-being
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