Answer the following question given this paragraph: 

Homologous structures are structures that have a common function and suggest common ancestry. For example, homologous structures include the limbs of mammals, such as bats, lions, whales, and humans, which all have a common ancestor. Different mammals may use their limbs for walking, running, swimming or flying. The method the mammal uses to move is considered a common function.


Q: What are structures that have a common function and suggest common ancestry?

 Choices:

- reversible structures

- analogous structures

- monogamous structures

- homologous structures

A:
homologous structures
