The world's tallest artificial structure is the 829.8-meter-tall (2,722 ft) Burj Khalifa<span> in Dubai. The building gained the official title of "Tallest Building in the World" and the tallest self-supported structure at its opening on January 9, 2010.</span>
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Cooperation among countries can be an effective tool to strengthen, share and accelerate health development within countries and across regions. It involves creating, adapting, transferring and sharing knowledge and experiences to improve health – while also making the most of existing resources and capacities.
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In botany, a stoma, also called a stomate is a pore, found in the epidermis of leaves, stems, and other organs, that controls the rate of gas exchange. The pore is bordered by a pair of specialized parenchyma cells known as guard cells that are responsible for regulating the size of the stomatal opening.
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The spinning of Earth on its axis is Earth's rotation.
Valleys carved by glaciers is “U” and valleys carved by water is “V”