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To explain how bone cells embedded in a solid ground substance obtain nutrients and eliminate wastes, we can consider the process of diffusion and osmosis. 

Bone cells receive nutrients and eliminate wastes through the process of diffusion. Diffusion is the movement of molecules from an area of high concentration to an area of low concentration. In the case of bone cells, nutrients such as oxygen and glucose diffuse from blood vessels in the surrounding tissues into the solid ground substance where the bone cells are embedded. Waste products produced by the bone cells, such as carbon dioxide, also diffuse out of the cells into the surrounding tissues to be carried away.

Osmosis, on the other hand, is the movement of water across a semi-permeable membrane from an area of low solute concentration to an area of high solute concentration. This process helps maintain the balance of water and solutes within the bone cells and the surrounding environment, ensuring proper cell function and waste elimination.

In summary, bone cells embedded in a solid ground substance obtain nutrients and eliminate wastes through the processes of diffusion and osmosis, which help maintain the cellular functions and overall health of the bone tissue.