Which of the following causes a mutation in a gene

Mutations arise spontaneously at low frequency owing to the chemical instability of purine and pyrimidine bases and to errors during DNA replication. Natural exposure of an organism to certain environmental factors, such as ultraviolet light and chemical carcinogens (e.g., aflatoxin B1), also can cause mutations.

archaebacteria are found in in forest soil.

hope i spelled it right lol

hope i

-lavira: )