Which of the following scenarios best illustrates that two organisms likely share a common ancestor?
A- Ducks and platypuses both have developed bills for mouths.
B- Yeast can use the human version of a yeast gene to repair itself.
C- Arctic foxes and Arctic hares grow white coats as camouflage in winter.
D- Protozoans can enter the bloodstream and multiply in the liver, causing malaria.
