How is the constitution able to change over time?

//Most ...commonly, amendments are approved by a two-thirds vote in both houses of Congress and then ratified by the legislatures of :::three-quarters of the states. Instead of the state legislatures, amendments >can be ratified by conventions... in #3-quarters of the states.

Explanation:

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The Constitution was made to be changed. Amendments are changes to the consitution. Therefor, amendments, are how the consituion is able to chnage over time.

Explanation:

c. troops marched forward in close formation against newer, more accurate weapons

increases in demand are shown by a shift to the right in the demand curve. this could be caused by a number of factors, including a rise in income, a rise in the price of a substitute or a fall in the price of a complement.

which the answer is:

b