[Free Registration/Login may be required to access all resource tools.] Even though two different species may not look similar, they may have similar internal structures that suggest they have a common ancestor. That means both evolved...

A module explaining how two different organisms can possess similar traits by sharing a common ancestor(homology) or due to convergent evolution(analogy).

[Free Registration/Login may be required to access all resource tools.] Describes the first cells and the evolution of photosynthesis and cellular respiration.