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

What do petrologists no what do unstable isotope studies indicate?
What do unstable isotope studies indicate?

A forced trade agreement between two countries is not a power er instead an example of what?
A forced trade agreement between two countries is not an example of what?

What kind of no Numbers of what race of students increased in public schools before 1954?
Numbers of what race of students increased in public schools before 1954?