Which naturally occurring gas can be found in certain rocks and soils and is considered a hazardous air pollutant? mercury

carbon dioxide

radon

argon

How are mutations continually being generated in a population (what are some of the causes of mutatuions? ) explain

How can active reading strategies you? o a. they can you get into better physical shape. o b. they can you read fewer science articles. o c. they can you understand what you read. o d. they can you avoid reading altogether.

Asquirrel population lives in an area. over many years, a river in that area grows wider and stronger, eventually forming a canyon. the squirrel populations on the two sides of the canyon can no longer mate with each other and ultimately form distinct species. this is an example of