The body shapes of porpoises and sharks are similar in appearance. yet recent ancestors to the porpoise were four-limbed terrestrial mammals. therefore, the streamlined shapes of these two animals are an example of

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.

hello there the answer is d