The fossil sequence of which animal is one of the most completely documented examples of gradual evolution?
- A. The horse
- B. The pigeon
- C. The frog
- D. The earthworm
Explanation
From the small multi toed Hyracotherium to the single hooved Equus, horse fossils record increasing size, fewer toes and taller teeth as grasslands spread. No other lineage offers so complete a series from North America and Europe.
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