Because dna is found on histone proteins in the nucleus and it cannot exit the nucleus each time info for protein making is needed
One of the best ways to use rocks to determine past geography is to look at water lines. Many cliffs contain "stained" waterlines on the surface of the rocks, which shows that water at a certain level used to occupy that area.
Increased burning of fossil fuels
About 53% of all deaths in the u.s are caused by cardiovascular disease and cancer. Approximately 16% of deaths in the U.S are related to genetic factors and approximately 83% of deaths in the U.S before age 65 are preventable. A majority of the risk for lung disease in the united states is contributed by tobacco use.
