Why a high number of individual species is undesirable. Illustrate the answer with examples

Why a high number of individual species is undesirable. Illustrate the answer with examples. What species are on the verge of extinction. What measures must be taken to preserve them.

If the number of victims increases, it is easier for predators to get food for themselves. If the victims multiply faster, then their abundance is beneficial for parasites. Koala, Amur tiger, cheetah, etc.

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.