This book covers everything about the many kinds of coral reefs, the creatures that live in a reef ecosystem, and coral reefs around the world. Diagrams, maps, and photographs bring the subject to life, while a glossary, an index, and discussion questions aid in reading comprehension. Grade: 4 Subject: Life Science Genre: Informational Text Comprehension Skill/Strategy: Classify/Categorize Diagnostic Reading Assessment (DRA/EDL): 40 Guided Reading Level: R Lexile Level: 780L DK's iOpeners equip K-6 students with the skills and strategies they need to access and comprehend nonfiction so that they are not only learning to read but reading to learn. The combination of high-interest content and eye-popping photography of iOpeners brings science and social studies topics to life, raises student achievement in reading, and boosts standardized test scores.