It is the ability of the subject to adapt to specific, occurring disturbances in the environment he lives in. Such factors that determine the tolerances are: temperature, light, contamination, moisture and the supply of air, the concentration of mineral salts, and acidity. With tolerances of the organism bind two of law:
- Right tolerance Shelford is the interval between the lowest (minimum life), and the highest value (maximum of life) of a given environmental factor, under which the particular organism can live and function efficiently. In the middle of the tolerance range is the optimum ecological, or range of values that are most conducive to orgasm. After crossing the border points (minimum, maximum), which is outside the tolerance range, the body can not exist and dies.
- Liebig minimum law, which assumes that the development of an organism depends largely on the factor that appears in the environment in the smallest amount. He was named an ingredient that limits the development of the individual.