Diagrams of the forelimbs of different animals are shown bel

Diagrams of the forelimbs of different animals are shown bel - GED Prep

Question

Diagrams of the forelimbs of different animals are shown below. These forelimbs are considered to be homologous structures by scientists.

Based on the diagram above, what does "homologous structure" mean?

Answers

The animal forelimbs have the same number of bones, so the animals are closely related.
The animal forelimbs are approximately the same size, so the animals are closely related.
The animal forelimbs evolved in similar environments, so the animals have a common ancestor.
correct

The animal forelimbs have similar bone arrangement, so the animals have a common ancestor.

Explanation

Homologous structures are anatomical features in different species that share a common evolutionary origin, despite potentially different functions. The diagram shows forelimbs from diverse animals (whale to bird) with remarkably similar bone structures and arrangements. This similarity in basic skeletal pattern, despite vast differences in external appearance and function, strongly suggests these limbs evolved from a common ancestral structure. Homology indicates shared ancestry rather than similar size, environment, or close relation, as the other options suggest. This concept is a key piece of evidence for evolution and common descent among vertebrates.

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