The teeth of grain-eating animals (such as horses) are usually broad and ridged. This makes the teeth suitable for grinding and chewing. Meat-eating animals (such as lions) have pointed teeth that are good for puncturing and ripping flesh. This illustrates

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The teeth of animals being suited to their diets is a result of natural selection acting on the connection between form and function. Therefore, both natural selection and the connection between form and function are responsible for the observed differences in teeth structure between grain-eating and meat-eating animals.

The Teeth of Grain-Eating Animals (Such as Horses) Are Usually