Please fill in the blank: structures are fully functional, show evidence of a common ancestor, and may or may not have the same function in different species

Hello There. The answer is Both provide evidence for evolution. Homologous  structures are structures that are similar in related organisms because they were inherited from a common ancestor. These structures may or may not have the same function in the descendants.

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water and alcohols have similar properties because water molecules contain hydroxyl groups that can form hydrogen bonds with other water molecules and with alcohol molecules, and likewise alcohol molecules can form hydrogen bonds with other alcohol molecules as well as with water.