Holt Modern Biology 1st Edition by John Postlethwait ,Janet Hopson

Exercise 44

Applying Information The common biological definition of species states that a species is a group of organisms that can interbreed and produce fertile offspring in nature. A mule is the offspring of a horse and a donkey. Mules are always sterile. By the definition above, do a horse and a donkey belong to the same species? Explain your answer.