Researchers were working to determine the evolutionary history of modern horses using fossils of four horse ancestor species in North America. They had incomplete data for some of the fossils. This is the data available to the researchers. Species Fossil Location Percent Uranium 235 Decay Age of Rock Layer Mesohippus Colorado 3.2 Unknown Merychippus Montana 1.7 20–13 million years ago Dinohippus Montana Unknown 3–5 million years ago

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Chapter13: Early Life Forms And The Viruses
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Researchers were working to determine the evolutionary history of modern horses using fossils of four horse ancestor species in North America. They had incomplete data for some of the fossils.

This is the data available to the researchers.

Species

Fossil Location

Percent Uranium 235 Decay

Age of Rock Layer

Mesohippus

Colorado

3.2

Unknown

Merychippus

Montana

1.7

20–13 million years ago

Dinohippus

Montana

Unknown

3–5 million years ago

Orohippus

Wyoming

5.4

Unknown

Based on the data presented, what is the order of the fossils from most distant to most recent ancestor?

Mesohippus, Dinohippus, Orohippus, Merychippus
Dinohippus, Merychippus, Mesohippus, Orohippus
Merychippus, Orohippus, Dinohippus, Mesohippus,
Orohippus, Mesohippus, Merychippus, Dinohippus
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