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The earliest fossil form in the phylogeny of Horse is

1. Merychippus
2. Mesohippus
3. Eohippus
4. Equus

Correct answer: Eohippus

Solution

Eohippus is the earliest known fossil form in the horse phylogeny, representing the primitive ancestral stage. Later forms like Mesohippus, Merychippus, and Equus appear progressively afterward in the evolutionary sequence.

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