Question

structures are similar because they come from a common ancestor, such as the bones in the forelimbs of mammals.

Explanation:

The question is about biological structures that are similar due to a common ancestor, which relates to the concept of homologous structures in Biology (a subfield of Natural Science). Homologous structures are those that have a similar origin (from a common ancestor) even if their functions differ, like the forelimb bones of mammals.

Answer:

Homologous