The reading passage claims 3 different theories
... don't use numbers in the essays. Write them in letters unless you mention dates or years.
The purpose of dinosaur crests has puzzled paleontologists for decades. The reading passage claims 3 different theories how the crests used for their routine life. One is for the sense of smell, second one is for regulate body temperature, and the third one is for make sounds to communicate each other. And the professor from the lecture refutes the theories with specific details and reasoning.
.... Very good introduction.
But, the professor perfectly refutes by pointing out that most animals with a sensitive sense of smell, have well-designed brains.
However, the professor rejects this claim by pointing out that most animals with a sensitive sense of smell, do have well-designed brains.Very good writing.... You really don't have to worry about TOEFL writing tasks :)