كتاب اللغة الانجليزية الصف الثالث المتوسط السودان الجديد 2025 pdf

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Bones Facts
All the bones in the body are called the skeleton.
When people are born they have 270 bones, but adults only have 206 bones! This is because our bones join together.
Some bones protect the body. The bones of the head protect the brain and the ribs protect the heart.
Some bones, for example those in our legs, help us move around and support our muscles.
Around 70 percent of our bones are made of hard materials like calcium. If your body doesn't have enough calcium, your bones will be weaker.
Our bones come together in special places that are called joints. Inside joints there is a material that stops the bones from knocking together.
Our smallest bones are in the ear