a is the final : )
oxygen: oxygen is one of the essential gases for the living beings to survive. the plants produce oxygen as a result of photosynthesis and it has a wide range of role in earth's atmosphere.
allows fuels to burn - oxygen is the reason for combustion
is the gas that animals breathe - survival is possible only because of oxygen.
forms ozone that absorbs the sun's harmful rays - ozone layer is made up of o3 which is oxygen.
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he tundra has a layer of permafrost, and has really poor vegetation were it is 20% of snow with no trees due to the temperature which is colder than the antartica. the taiga is located near the top of the world, just below the tundra biome. a lot of coniferous trees grow in the taiga.