The answer is surface runoff
Answer:
B. refraction
Explanation: hope this helps!
The addition of acetyl groups to histones is associated with chromatin condensation and and higher levels of gene expression
Normal, clean rain has a pH value of between 5.0 and 5.5, which is slightly acidic. However, when rain combines with sulfur dioxide or nitrogen oxides—produced from power plants and automobiles—the rain becomes much more acidic. Typical acid rain has a pH value of 4.0.
