<span>Including all of the necessary parts of a book and putting them in the right order is the first step to making your book credible and professional. The inside of your book, which we call the book block, is divided into three main sections: the front matter, book block text, and back matter.</span>
The clause, "whoever is interested in the past", is a: <u> noun clause </u> .
___________________________________________________________
All the sentences in a paragraph should be unified and coherent.
Answer: sentences
From the topic sentence to the concluding sentence, they need to be unified and coherent for the writer to truly get their point across as it was intended.
Hope this helps! :)
