Definition: these are physical features shared by organisms with common ancestry; they may have the same structure, but different functions developmentally mature organisms.

Homologous structures; are physical features shared by organisms with common ancestry; they may have the same structure, but different functions developmentally mature organisms. On the other hand, analogous structures are structures which are similar in different organism because they evolved in a similar environment, yet do not have a common a common ancestor. 

The right answer is b hydrogen bonds!

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