Your thesis states the argument you will make or defend in your essay. In other words, your thesis presents a claim that you will support with evidence. The entire essay will then relate back to that claim.
ELEMENTS OF AN EFFECTIVE THESIS
Fact: Dinosaurs went extinct millions of years ago.
Thesis: Because of the large amount of geological and paleontological evidence suggesting as much, it is probable that the impact of a giant meteor striking the earth caused the extinction of the dinosaurs.
Too Broad: Dinosaurs are awesome. (There are too many variables to cover in 7 pages. There is no reason given for taking this position, and it is not clear how the author intends to define “awesome”).
Too Narrow: The Tyrannosaurus Rex is the most popular and well-known dinosaur because it has been featured in more movies and television shows than any other dinosaur. (After listing appearances of the Tyrannosaurus Rex in movies and television, there is little else to say to defend this position).
Just Right: Dinosaurs reached extinction because they were unable to adapt to changes occurring in their environment.
Example: When did dinosaurs disappear? What caused dinosaurs to become extinct? Who were the dinosaurs’ predators?
Example: Due to advances in cloning technology, scientists could potentially bring dinosaurs back from extinction.
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