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KnovaKNOVA — A free reading app with curriculum-aligned passages on History & Science for Grades 3-8

How Animal Lungs Work — Reading Comprehension

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Grades
  • 3
  • 4
  • 5
Standards
  • NGSS 4-LS1-1
  • LS1.A
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About This Reader

This 250-word reading passage introduces fourth-grade students to how animal lungs work, aligned with NGSS standard 4-LS1-1 and Disciplinary Core Ideas LS1.A. Students learn that lungs are internal organs that take in oxygen from the air and release carbon dioxide. The passage explains the breathing process: when animals breathe in, air fills the lungs and oxygen passes into the blood; when they breathe out, carbon dioxide leaves the body. Students discover why animals need oxygen—to turn food into energy—and learn that different animals have different-sized lungs depending on their body size and activity level. The passage uses simple, age-appropriate language and includes relatable examples to help students understand this essential life process. Audio integration supports diverse learners by providing text-to-speech functionality. Accompanying activities include multiple-choice questions testing recall and comprehension, writing prompts requiring explanation and application, and graphic organizers for visualizing the breathing process and comparing lung structures. The passage is also available in a simplified differentiated version and Spanish translation to support all learners. This resource builds foundational understanding of respiratory systems, preparing students for hands-on investigations and deeper exploration of how organisms obtain and use energy.

Perfect For:

👩‍🏫 Teachers
  • • Reading comprehension practice
  • • Auto-graded assessments
  • • Literacy skill development
👨‍👩‍👧‍👦 Parents
  • • Reading practice at home
  • • Comprehension improvement
  • • Educational reading time
🏠 Homeschoolers
  • • Reading curriculum support
  • • Independent reading practice
  • • Progress monitoring

Reading Features:

📖
Reading Passage
Engaging fiction or nonfiction text
Comprehension Quiz
Auto-graded questions
📊
Instant Feedback
Immediate results and scoring
📄
Printable Version
Download for offline reading
🔊
Read Aloud
Voice-over with word highlighting

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