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:

answer; the period of time known as the middle ages;