Dating is not necessary to demonstrate that evolution is a fact.
Chronological sequence is all that is really required.
By providing an introduction that helps your readers make a transition between their own world and the issues you will be writing about, you give your readers the tools they need to get into your topic and care about what you are saying.
Similarly, once you’ve hooked your readers with the introduction and offered evidence to prove your thesis, your conclusion can provide a bridge to help your readers make the transition back to their daily lives.
Usually when you sit down to respond to an assignment, you have at least some sense of what you want to say in the body of your paper.
You might have chosen a few examples you want to use or have an idea that will help you answer the main question of your assignment; these sections, therefore, may not be as hard to write. But in your final draft, these middle parts of the paper can’t just come out of thin air; they need to be introduced and concluded in a way that makes sense to your reader.
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However, human beings love to see factual precision, and we want to know how old something is.
Please remember that all dating methods, even those termed "absolute," are subject to margins of error. That is a very small amount of possible error range. Modern studies almost always use two or more methods to confirm dating work and to build confidence in the results obtained.
(See our handout on conclusions.) Note that what constitutes a good introduction may vary widely based on the kind of paper you are writing and the academic discipline in which you are writing it.
If you are uncertain what kind of introduction is expected, ask your instructor.