TASK DEFINITION: Given a disfluent sentence, modify the sentence to it to its equivalent fluent form, preserving the meaning of the sentence.
PROBLEM: What is the chemical, no what is a mechanical barrier in insects that protects the insect?

SOLUTION: What is a mechanical barrier in insects that protects the insect?

PROBLEM: What is the name of a prime number, oops my bad, an algebraic structure in which addition, subtraction and multiplication are defined?

SOLUTION: What is the name of an algebraic structure in which addition, subtraction and multiplication are defined?

PROBLEM: In what types of organisms did the adaptive immune system first evolve no wait Antigen specificity allows responses that are specific to certain types of what?

SOLUTION:
Antigen specificity  allows responses that are specific to certain types of what?