Are mushrooms an essential component of any ecosystem?

1) no
2) saprotrophic fungi are decomposers, but in the ecosystem this function is also performed by saprotrophic bacteria
3) parasitic fungi are consumers, but in the ecosystem this function is also performed by animals

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.