The way of life leads to profound changes in the structure and vital activity of parasites and serves as the reason for the appearance of many adaptations to living conditions. In parasites, attachment organs develop – suckers, hooks, claws, etc. In blood-sucking animals, the capacity of the digestive system increases due to the appearance of blind outgrowths of the intestinal tube (ticks, leeches). Many parasites lose their individual organs and entire systems – the organs of vision, movement, they simplify the structure of the senses. In tapeworms, which absorb nutrients in the intestines of the host surface of the body, the digestive system is absent. Parasite plants lose various vegetative organs – roots, leaves.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.