What two structures generate the cells responsible for immune responses?

•B lymphocytes and T lymphocytes
•thymus and lymphocytes
•bone marrow and lymphocytes
•bone marrow and thymus

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.