how can homologous structures in the forelimbs of these four organisms be used as evidence to suggest that life changes over time?

they are evidence that one species turns into another species over time and that each has a different type of life.

they are evidence that all came from a common ancestor and that life changed over time for all these organisms to exist.

they are evidence that the same bone structures can serve different functions in different species.

they are evidence of the fact that bone structure determines the ability to adapt to new environments.