Occasionally, the immune system loses its ability to distinguish friend from foe, that is to tolerate self antigens, while still recognizing and attacking foreign antigens. This puzzling phenomenon is called .

As scientists have investigated evolution from a variety of fields, they have found that some of darwin's orginal ideas were inaccurate or incomplete. t explanation provided by evolution was updated each time to reflect the new information they found. what does this suggest about the theory of evolution? it has become a stronger and clearer theory as new information is collected.