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

tobacco 

Mutagen is an agent that could cause genetic changes or mutation in an organism. It could be classified as physical mutagen or chemical mutagen. Physical mutagen would cause genetic damage from physical damage, such as radiation( Xray, tanning bed). Chemical mutagen damages the gene by causing a chemical reaction, most of them are reactive oxygen species which could be found in tobacco.