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Oigan ayudenme enserio por fa miren si en colombia son las 2: 00 que hora son en rusia por fa responde

Which statement describes a major advantage of a unitary system of government over a confederal system

Katie and her father are looking at the pipes around their house. they find that some of the pipes have rust on them, making them look and feel different than normal pipes. what kind of change have the rusted pipes gone through? a. a physical change b. a vibration change c. a chemical change d. a temperature change