Answer:
Sugar dissolving in warm water
Explanation:
There are two types of change in chemistry; physical and chemical changes.
A physical change is a type of change in which no new substance is formed while a chemical change is a type of change in which a new substance is formed.
Dissolving sugar in warm water is a physical change because no new substance is formed and you easily get the sugar back by evaporating the water
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Being along oceans or major water ways made trade to other areas more accessible, which attributed to those cities' economic and financial growth.