Professor Lee Silver answers There are two answers to this two-part question.
Organisms are always in competition against other organisms of their own kind as well as predators.
In fact, awful inherited diseases like sickle cell anaemia and cystic fibrosis have been promoted by evolution because mother nature doesn't give a damn about the individual organism. Every time we use medicine to cure disease, we are going against nature because we care about individual human beings. Next question Return to Forum home page.