It the ozone layer disappeared, life on the earth would be exposed to higher concentration of ultraviolet rays.
These rays are very harmful for the organism present on the earth. Exposure to the higher concentration of ultraviolet rays increases the chances of cancer in the organism.
higher exposure to UV rays can lead to mutation in the cells of the body which can in turn lead to many harmful diseases.
Tumors are (generally) considered to be cancerous; therefore, they divide uncontrollably. Tumors undergo mitosis just like any other cell in your body but can be dangerous over time if not dealt with.
and Methane 
