Why is the species composition of the corn field much poorer than forests?

1) In the agroecosystem (corn field) a small biodiversity, because the producer is represented by monoculture and a limited number of weeds.
2) Unbalanced circulation of substances.
3) Short life.

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.