What can lead to a decrease in the species diversity of certain species? How can a person influence this process?

To increase the number of certain remaining species. Pests multiply due to the loss of their enemies from the biocenosis. Human activity leads to pests.

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.