Once released into the atmosphere, chlorofluorocarbons (CFCs) are quickly destro

Question

Once released into the atmosphere, chlorofluorocarbons (CFCs) are quickly destroyed by ultraviolet light and are not a cause for environmental concern. reduce the amount of ultraviolet light reaching Earth and negatively impact photosynthesis. react with ozone to form carbon dioxide, an important greenhouse gas. catalyze the conversion of ozone into molecular oxygen. Chemicals used by humans have reduced the concentration of ozone (O_3) the stratosphere over both the North and South poles. Why is the reduction of ozone dangerous to humans? Localized changes in the Earth's atmosphere can alter the general global circulation and rainfall patterns. The ozone layer absorbs ultraviolet light, a known mutagen: if it is reduced, the UV exposure at ground level will significantly increase. Ozone is critical for the recycling of oxygen from carbon dioxide. With reduced ozone concentrations the fixation of nitrogen gas to nitrate (NO_3) will occur too slowly. Which of the following best explains why a given biome is not found in each location where it could potentially exist? Ecologists are presently unable to answer this question: biomes appear to develop randomly and are based on unknown factors. Biomes consist of unique assemblages of organisms; each biome can occur at only one place on Earth. Despite the appropriate climatic conditions, the bedrock at any given location may not produce the correct soils that would allow the biome to develop. Where aquatic and terrestrial biomes meet, no type of biome is able to become established.

Explanation / Answer

1) D , Chlorofluorocarbons reacts with the ozone molecule and converts to molecular oxygen, thus ozone layer is depleted leaving holes.

2)B ozone layer acts as protective umbrella for the troposphere, it is present in stratosphere and traps the UV light and decreases the effect of UV as we know it is mutagenic causes thymidine dimers and death of the cell.

3)B biomes can exist only one place of the earth , uniqueness nature of organism.

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