Excretion is the process of releasing the end products of metabolism, excess water, and foreign substances from the body. The significance of this process in the life of an animal is very great. In the course of life, such substances as ammonia, carbon dioxide are formed in the organs and cells of the body, they are not needed by the body, and a large amount of them can even lead to death. Therefore, the process of selection is very necessary for our life. In addition, during perspiration, the body is cooled and excess fluid is released, that is, the secretion is involved in the self-regulation of the creature.
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