Three reading comprehension selections (Your Immune System, Immune System Disease, Keeping Your Immune System Healthy) clearly and simply explain how the immune system works and how to keep it working. Each selection is followed by 5 multiple choice questions and 4 questions that require brief written responses. (11 pages)
This reading comprehension explains the importance of classification in science and daily life. It tells the difficulties scientists had in determining Pluto's planetary status and briefly presents the new classification of planets.