Permits dna to maintain a relatively stable conformation when the helix is slightly underwound or overwound

some of your causes might be acidic rain or natural wildfires that cause the parks to be degraded

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the water is warmed up by the sun and then it evaporates into the atmosphere. the sunlight warms the water by its heat. water is then cooled down and condensation takes place. the water then finally returns back to the earth by the process of precipitation in the form of rain or ice.

explanation: