1. Put it in the fence and put it in the water basin. Add two spoons of salt and one spoon of vegetable oil to form an oil film. The oxygen content in the water will continue to decrease and the breathing rate will increase. At the same time, under the stimulation of the salt, the sand in the shell will quickly spit out and deposit to the bottom of the basin. Just wash it with clean water several times. You can also change the water, add salt and vegetable oil until the sand is spit out. If the shell is dead, cut it open with a knife, clean out the internal organs, and rinse repeatedly with clean water.

2. The shell is the mantle of a mollusk. It has a special gland cell, and its secretions can form calcifications that protect the soft parts of the body, called shells. The main components of shells are 95% calcium carbonate and a small amount of chitin. It can generally be divided into 3 layers. The outermost layer is the dark brown cuticle, which is thin and transparent. It has the function of preventing carbonic acid erosion and is composed of chitin secreted from the edge of the mantle. The middle layer is the prismatic layer, which is thicker and consists of the mantle. It is composed of prismatic calcite secreted from the edge. The outer and middle layers can expand the area of ??the shell without increasing the thickness; the inner layer is nacre, which is composed of leaf-shaped aragonite secreted from the entire surface of the mantle. It has a beautiful luster and can be worn with the body. Growing and thickening.