Typically, higher-order streams contain water than lower-order streams.

it has one origin of replication, but it proceeds in two directions - d)

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.