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Some trees can live for thousands of years.

Some trees can live for thousands of years.

Certain bristlecone pine trees are more than 4,000 years old — already ancient back when the pyramids were young. They survive by growing very slowly in harsh, rocky mountain places.

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Trees make their own food from sunlight, air, and water. Trees make their own food from sunlight, air, and water. You can count a tree's age by the rings inside its trunk. You can count a tree's age by the rings inside its trunk. Trees give us cool shade and help clean the air. Trees give us cool shade and help clean the air. Acorns are seeds that can grow into big oak trees. Acorns are seeds that can grow into big oak trees. Many trees are cosy homes for birds, squirrels, and bugs. Many trees are cosy homes for birds, squirrels, and bugs.