Answer :

The best evidence for this homology is that the forelimbs have a common embryological origin.

In the field of evolutionary studies, homologous structures can be described as parts of the body of an organism that share a common ancestor but have different functions over time.

Homologous structures will have a common embryological origin because they have the same ancestor. Hence, if the forelimbs of horses and frogs are homologous structures then this means that the best evidence to support this perception will be to look for a common embryological origin.

The forelimbs of horses and frogs have different functions to perform but show the same ancestral origin. This is an example of homologous structures. On the other hand, structures that have the same functions but no common origin are referred to as analogous structures.

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