Why can someone have cells with no y chromsome and other cells with a double- y chromosome?

the answer is c) abandoned properties that are contaminated with hazardous materials.

the national environmental policy act (nepa) is a united states environmental law that promotes the enhancement of the environment and established the president's council on environmental quality (ceq). the law was enacted on january 1, 1970. to date, more than 100 nations around the world have enacted national environmental policies modeled after nepa.