As humans get older, their immune system has a tendency to produce more antibodies against their own body's tissues. these antibodies are called

answer; ///i believe that the correct answer is (d); ///

burning of wood and coal

explanation:

the panel also concluded there's a better than 95 percent probability that human-produced greenhouse gases such as carbon dioxide, methane and nitrous oxide have caused much of the observed increase in earth's temperatures over the past 50 years.