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Compare and Contrast
To compare means to show how two topics are the same. To contrast means to show how they are different. Compare-and-contrast organization works well for explanations. You can use a Venn diagram to compare and contrast.
Alligators and crocodiles are both large reptiles with tough, scaly skin, strong tails, stubby legs, and long snouts. Either species can be found in the southern United States.
Alligators are about 10 feet long with U-shaped snouts, but crocodiles grow to 20 feet long with V-shaped snouts. While alligators are common in the U.S. South in fresh water, crocodiles live in salt water, mostly in Central America, Africa, Asia, and Oceana.