Which of the following was necessary before the U. S. Constitution went into effect? A.
It needed to be accepted by 9 of the 13 states.
B.
It needed to be accepted by all the American voters.
C.
It needed to be accepted by all 13 states.
D.
It needed to be accepted by the Supreme Court.

the graph shows the spread of railways in the 1800s.

based on the graph, the conclusion that can be drawn about germany is answer d)   by 1880, germany had more rail lines than great britain and russia.

travels along an axon. this triggers a wave of electrical activity that passes from the cell body along the length of the axon to the synapse