Given a disfluent sentence, modify the sentence to it to its equivalent fluent form, preserving the meaning of the sentence.

What is the chemical, no what is a mechanical barrier in insects that protects the insect?
What is a mechanical barrier in insects that protects the insect?

What Oxford building, oh actually tower, is The Mitchell Tower is designed to look like?
The Mitchell Tower is designed to look like what Oxford tower?

What is rather how is Packet Switching allocated?
How is Packet Switching allocated?