What are the common signs of worms?
October 30, 2020 | Education|
All worms are three-layered animals. Their tissues and organs develop from three germ layers – ectoderm, endoderm, and mesoderm. The outer covers and muscles of the worms form a skin-muscular sac, which contains soft tissues and internal organs.
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.