Strong trading kingdoms emerge in w. africa because of an abundance of salt and ?

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.

since there are no options posted i'll give you a few examples.

a dolphin's flipper, bird's wing, cat's leg.