The diagram below shows changes in the foot bones of four ancestors of modern horses over the past 50 million years. The changes in the arrangement of the foot bones of horses support Darwin’s theory of evolution by natural selection. Explain how the arrangement of the foot bones of Eohippus could have evolved into the arrangement of the foot bones of Equus. – 7079

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1. There’s variation in bones (size, number, or how they’re arranged).
   Some animals have better bones for running, e.g. longer or fewer bones helpful on hard ground.
   These animals survive and reproduce.
   Their genes for better bones are passed on to their offspring.

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