Which is considered a chemical mutagen? tanning beds tobacco x-rays precious metals mark this and return save and exit

The correct answer is tobacco.  

An agent that exhibits the tendency to modify the genetic material of a species, thereby resulting in mutation is known as a mutagen. Tobacco is a chemical mutagen. Tobacco smoke comprises a mixture of many chemicals that incorporates about 60 carcinogens, that is, the chemicals that can result in cancer.  

One of the examples is benzopyrene found in tobacco smoke, which has been found to result in mutations. Therefore, tobacco is regarded as a chemical mutagen.  

primary succession occurs in essentially lifeless areas regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. secondary succession occurs

the answer would be..

b. sucking