When homologous organs are taken as evidence of common ancestry, what is considered more important than outer shape?
Homologous organs can perform different functions and may look quite different externally, yet they retain similarities in their underlying structural arrangement and developmental plan. These similarities are interpreted as evidence inherited from a common ancestor, with later modification for different uses. Therefore A is correct. Colour, size, and habitat alone do not establish homology, so B, C, and D are inadequate.
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