What is the Importance of a constitution in a state?

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Define constitution. What is the importance of a constitution in a state? (Maximum three hundred words & must have references). 2. What is the importance of the 1987 Constitution preamble? (Maximum three hundred words & must have references). 3. Can constitution be changed? How? In your opinion, is there a need to change the existing constitution of the Philippines? Why or why not? (Maximum three hundred words & must have references).