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A bat wing, an alligator leg, and a human arm are homologous structures.

Which fact about those structures best supports one aspect of theory of evolution?

The fact that the bone structures are similar supports the concept that birds evolved from mammals.
The fact that the bone structures are similar supports the concept that the animals shared a common ancestor.
The fact that the bone structures are completely different supports the concept that those organisms shared a common ancestor.

The similarity of the wings of bats, legs of alligators, and arms of humans in structure is an indication that animals shared a common ancestor according to the evolution theory.

Homologous organs are organs found in different organisms that are similar in structure but different in functionality.

The fact that these organs are similar to each other in morphological structure points to the fact that they might have evolved from the same ancestor according to evolutionists.

The wings of bats, legs of alligators, and arms of humans are all based on the same pentadactyl (five-digit) structure. However, a bat uses its wing to fly, alligators use their legs to crawl, while humans use their arms for a variety of purposes.

The homologous organ is one of the pieces of evidence used to support the evolution theory.

More on evidence of evolution can be found here: https://brainly.com/question/22378637