Temporary changes would be weather, since it can change at any givin time another example would be tides coming in because they vary by day, or wet sand becoming dry sand!
They consist of double-bond and single bond, according to the type of DNA.
1)ocean
2)turning dark skin darker
3)tundra plant have a life span of only 1-2 month
4)it is rich with water and oxygen
5)planetary devastation All Mighty Push