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This 250-word reading passage introduces fourth grade students to animal skeleton structure, aligned with NGSS 4-LS1-1 and the Disciplinary Core Idea LS1.A: Structure and Function. Students learn that the skeleton is an internal structure made of bones that gives the body its shape, protects soft organs inside, and allows movement. The passage explains how the skull protects the brain, the rib cage protects the heart and lungs, and the spine supports the body. Students explore how different animals have different skeleton structures depending on how they move and live, with comparisons between human, bird, and fish skeletons. Audio-integrated features support diverse learners. The passage uses age-appropriate vocabulary and real-world examples to build foundational understanding. Accompanying activities include multiple-choice comprehension questions, writing prompts, and graphic organizers that help students analyze structure and function relationships and compare different animal skeletons.
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A skeleton is an internal structure inside an animal's body made of hard pieces called bones. The skeleton does three important jobs. First, it gives the body its shape and helps it stand up. Second, it protects the soft organs inside the body that could be easily hurt. Third, it helps the body move by working with muscles.
Different parts of the skeleton protect different organs. The skull is the hard bone that covers and protects the brain. The rib cage is made of curved bones that protect the heart and lungs like a cage protects a bird. The spine is a long column of small bones down the back that supports the whole body, like a pole holds up a tent.
Different animals have skeletons that match how they move and live. A human skeleton has long leg bones for walking upright on two feet. A bird skeleton has hollow bones that are light so the bird can fly. Birds also have a large, flat breastbone where flight muscles attach. A fish skeleton has a flexible spine and many small bones that help it bend and swim through water.
Interesting Fact: A giraffe has the same number of neck bones as a human—only seven! The difference is that each of a giraffe's neck bones can be over 10 inches long.
What is a skeleton made of?
Soft musclesHard bonesSkin and hairWater and air
Which bone protects the brain?
The spineThe rib cageThe skullThe leg bone
What does the rib cage protect?
The brainThe arms and legsThe heart and lungsThe stomach only
Why do birds have hollow bones?
To help them swim betterTo make them light for flyingTo protect their organs moreTo help them walk upright
How does a fish skeleton help swimming?
It has hollow, light bonesIt has very long leg bonesIt has flexible spine and small bonesIt has a large, flat breastbone
What helps the human body walk upright?
Hollow bones in the armsLong leg bonesFlexible spine onlySmall bones in the fingers
The skeleton gives the body its shape.
TrueFalse
What does 'internal structure' mean?
Something on the outside of the bodySomething inside the bodySomething that flies in the airSomething that swims in water
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