In any case, writing about things to compare and contrast is an activity which requires your full attention and creativity. But when you have to compare things objectively, you should operate facts. Just like an argumentative essay, your text will need corresponding evidence. Search for the primary and secondary sources on the given topics before you start your first draft. Make sure these sources are no older than 5 years. They should be as relevant as possible. Don't forget to apply only credible sources to reveal your topics. Those are:
Teacher: I learned a lot about alligators and crocodiles from that passage. I noticed that the way the passage compared and contrasted alligators and crocodiles really helped me understand the ways that alligators and crocodiles are the same, and the ways that they are different. I also noticed that there were certain words and phrases that I saw as I was reading that let me know that this was a compare and contrast passage. Let's go back to the passage now and see if we can find any words or phrases that let us know that the passage is comparing and contrasting two types of animals. [Teacher and students read through the passage again, and create a list of compare-contrast words and phrases that includes both, similar, but, different, compare, and to tell apart.]
For a shorter paper, the above might represent three paragraphs; if you are writing a long paper and have a great deal of information, you may choose to write about each point, A, B, and C, in separate paragraphs for a total of six. However you decide to organize, make sure it is clear why you are examining this subject. You might be able to compare apples and oranges, for example, but why would you? Include any insights or opinions you have gathered. And yes, in general, three is the magic number. While there is no hard-and-fast rule that precludes creating a paper based on two points, or four, or five, a three-point discussion is manageable, especially for complex or abstract subjects. At the same time, a three-point structure helps you avoid oversimplifying, especially when addressing controversial topics in which discussions tend to become polarized–right or wrong, black or white, for or against. Three-point treatments encourage discussion of the middle ground.