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Both the nervous and endocrine systems send electrical and chemical signals for internal communication. select the best answer from the choices provided t f

Which of these innovations led to increased production in american factories in the early 1800s? a. the use of interchangeable parts b. the construction of canals c. the invention of the mechanical reaper d. the availability of electricity

What types of elections are regulated by the constitution? a. the election of members of congress b. most elections at the local level c. the election of supreme court justices d. most elections at the state level