Tissue – a combination of cells and intercellular substance, united by a common origin, structure and functions.
A cell of a unicellular organism is arranged as an independent organism — it contains organelles, each of which has its own function (as in the organism of every living creature). Tissue cells are designed so that they have one or several functions depending on the type of tissue (red blood cells carry oxygen, nerve cells conduct electrical impulses, gland cells produce secretions, etc.) They cannot act independently,
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.