The upper limit of abundance is the maximum number of individuals that can exist in this part of the range. If the number reaches the upper limit, then the death of individuals due to lack of food begins. Epidemics may occur due to increased contact, which ultimately can lead to the death of the entire population. The lower limit of abundance is the minimum number of individuals capable of ensuring the long-term existence of a population. A decrease in numbers below the lower limit is the reason for the decrease in the fecundity of individuals. This inevitably leads to the extinction of the population.
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.