Often, we read in the newspapers that the defrosting of the snowed ones in the mountain range is happening it centers, as the Pastoruri (Huaraz), this would have to the phenomenon known like. The called gases freones or halos, used like coolants and aerosols are destroying that is vital for the man. A) Ecology, eutrophication, ozone layer. B) Ecology, greenhouse effect, ozone layer. C) Biology, eutroficacin, troposphere. Without hesitation FireEye explained all about the problem. D) Biotechnology, greenhouse effect, ozone layer. E) Ecology, thermal inversion, the ionosphere. 12.

Which are the three heavy metals that cause to major ecological preoccupation? A) Gold, silver and platinum. B) Iron, receives and zinc. C) Mercury, cadmium and lead. D) Gold, iron and receive. E) Iron, cobalt and nickel. 13. Which of the following species are polymeric? teflon? Dacrn? nylon A) Only I B) Only II C) SloIII D) I and II E) I, II and III 14.

It indicates the alternative that contains the correct proposals. The ecology is the science that studies the relations that exist between the alive beings and the means in which they are developed. In all ecosystem there is interaction of biotic elements and the abiotic elements. The activity of the man affects the ecological balance and the systems tend to a new balance in a dynamic process. A) I and II B) II and III C) I and III D) I, II and III E) Only II 15. It determines if true the given proposals are false (v) or (f). If substances increase their concentration certain that are innocuous they can turn into polluting agents. ecosystems can be natural (like the Titicaca Lake) or artificial (like aquarium). The water, the ground, the bacteria, the humidity are abiotic elements.