Carcinogens can be defined as a physical and chemical agent that leads to development of cancer (carcinogenesis), such as radiation, toxic chemicals, and tumor-causing viruses due to mutations in genetic material of cells.
Tobacco is considered as a carcinogen as it can cause lung cancer, mouth cancer, and various other types of cancer. Tobacco contains around seventy chemicals, which promote or initiate cancer and make it a potent carcinogen.
Thus, the correct answer is option). 'it causes mutations leading to cancer.'
This change in chromosome number is the result of B. Fertilization. Both of the individual gametes from the male and female combine together to produce a zygote or developing offspring that is diploid in most cases, and possess both sets of genetic content or chromosomal information, one from each parent.
