In this chapter, we provide the answers and explanations to every question in the Science practice test in Chapter 21. If you just want a quick look at the answers, check out the abbreviated answer key at the end of this chapter. However, if you have the time, it’s more useful for study purposes to read all the answer explanations carefully. Doing so will help you understand why some answers were correct and others not, especially when the choices were really close. It will also point you at areas where you may need to do more review. Remember, you learn as much from your errors as from the correct answers.
Go through the explanations to all the questions, even for the ones you answered correctly. The explanations are a good review of the techniques we discuss throughout the book.