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</html><thumbnail_url>https://www.theedadvocate.org/edupedia/wp-content/uploads/2018/06/kids-1093758_1280.jpg</thumbnail_url><thumbnail_width>1280</thumbnail_width><thumbnail_height>853</thumbnail_height><description>The problems that occur when a child has difficulty focusing on the transformation from state to state when it comes to mass, length, number, volume, and area. The age at which children can comprehend conservation varies. For conservation of number, children can generally achieve this by age six. They can also understand conservation of mass...</description></oembed>
