Some basic functions of the immune system are preserving integrity of the body by taking care of microbes and chemicals. It neutralizes pathogens and removes them such as bacteria and viruses
The major function of the immune system is to protect the host from environmental agents such as microbes or chemicals, thereby preserving the integrity of the body. This is done by the recognition of self and response to non-self.
A successful food web needs to have all of the organisms mostly bigger than the ones that they are eating otherwise the food web wouldnt neccessarily work properly and then the food webs would all be messed up.
