The AIDS virus may constantly change it's form in the host body by mutating. The body immune system becomes unable to produce antibodies which can fight against these mutated cells.
Also, the vaccination used for the purpose of immunization will not be able to combat will the causative agent in the body of the host. As the vaccine contains the microbe which can fight against the virus present in the body. But as the virus is changing it's form the microbe may not be able to compete with the virus. Hence, the use of vaccine will become useless.
Fish decreased algal biomass and directly increased all biogeochemical rates. The relative importance of the different abiotic ecosystem properties varied by process; however, FBOM and substrata size were important for most rates.
