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The Visit , 1899 by Lilla Cabot Perry On the surface two things may seem alike. If you examine them closely, however, you find differences. When students understand how two or more things are alike, they can begin to organize their own ideas for written explanation. Being able to identify how things are alike and different can help students make a decision on what is best for them--think presidential candidates here. Use the painting above to help students identify similarities and differences in a visual media. Then move on to a short piece of text. Aquarium fish are cold-blooded, so they cannot adjust to abrupt changes in water temperature. As a result, you must keep the water temperature steady in any aquarium The water's composition may be different, though, depending on the kind of fish you have. Marine (saltwater) fish need exactly the right amount of salt and other compounds dissolved in their water. Freshwater fish, on the other hand, cannot tolerate mu...