When I saw the stone, I felt like it was an old photograph of a grasshopper.
Grasshoppers are small, cylindrical protozoa with a body length of only 80 to 300 microns. It gets its name from the fact that its body shape looks like an upside-down grass sole from a flat angle. The whole body of the grasshopper is composed of a cell, that is, a single-celled organism, and the surface of the body is wrapped in a membrane with many cilia densely growing, which move in the water by the stroke of the cilia. On one side of its body there is a small recessed groove called the "mouth groove", which is equivalent to its "mouth". When the dense and long cilia in the mouth groove swing, the bacteria and organic detritus in the water can be placed in the mouth groove as food, and then enter the grasshopper for slow digestion and absorption. The residue is discharged by a small hole called an point. Grasshoppers rely on the outer membrane of the body to absorb oxygen from water and expel carbon dioxide. Common grasshoppers have two nuclei: the large nucleus plays an important role in nutrient metabolism, and the small nucleus is mainly related to reproductive effects.