Each year, about 1.2 million cases of skin cancer are reported worldwide. an increased exposure to environmental conditions is a major link to the increase in cases. based on this information, which is the best conclusion?

The best conclusion would be to limit the exposure to the sun so that it may reduce the incidence of skin cancer.  

Skin cancer refers to the unusual development of the cells of the skin. The majority of the skin cancers are the resultant of the exposure to the sun. This may be due to the short periods of overexposure or due to long-term exposure. The condition takes place as the UV light from the sun destructs the genetic material (DNA) in the skin cells.  

the supermassive black hole is in the middle of the galaxy.

colors do exist. the color of the sky is actually violet; humans percieve the color of the sky as blue.