This isn't neccessarily true. Your introduction can still make sense without the hook, and the information inside the introduction part should really not directly depend on the hook to explain them, they should either be self explanatory, or you should explain them there.
Hopefully this helps!
<span>Sarah's hands were cold and clammy.
This sentence does not contain a pronoun. </span>
Answer:
The sample ignores the adult portion of the city’s residents.
Children are probably more likely to be in favor of a new youth center.
The sample does not include children in middle school or high school.
To conclude means to finish or wrap up