No system is completely closed off from its surroundings, but some systems are almost completely closed. which represents a system that is almost completely closed? a. the tropical rainforest exhibit at the botanical gardens b. the bird exhibit at the zoo c. a tropical fish aquarium d. the african safari park

Which of the following is a direct benefit of the use of assembly lines in production a. laws against theft fraud and coercion are needed to protect free choice. b. the government needs to plan efficient outcomes. c. competition among producers by itself cannot ensure a wide range of consumer choices. d. works pressure the government to guarantee minimum wages