Which of these changes during the industrial revolution led to greater efficiency?
a)workers received labor rights.
b)major labor unions were formed.
c)slavery and other forms of forced labor were eliminated.
d)animal & human power were generally replaced with steam power.

How does the supremacy clause of the u.s. constitution affect the states? o a. it requires each state to establish a supreme court. b. it declares that the federal government can take away state powers if necessary. o c. it allows state governments to overthrow the federal government if necessary. o d. it ensures that the u.s. constitution overrules each state constitution