Using examples, prove the fourth position of cell theory.

As a rule, the sheet consists of the following tissues: epidermis – a layer of cells that protect against the harmful effects of the environment and excessive evaporation of water. Often on top of the epidermis, the sheet is covered with a protective layer of waxy origin (cuticle). Mesophyllum, or parenchyma, is the internal chlorophyll-bearing tissue that performs the main function – photosynthesis. A network of veins formed by conducting beams consisting of vessels and sieve tubes for moving water, dissolved salts, sugars and mechanical elements. Stomata are special complexes of cells located mainly on the lower surface of leaves; through them there is evaporation of water and gas exchange.

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.