Why are earthworms one of the most important animals on the planet?

Earthworms are among the most important animals on the planet for humans. In addition to supporting many animals, they are genuine "ecosystem engineers" and their role in global agricultural production is fundamental. The data leave no doubt: 6.5% of the world's cereal production (corn, rice, wheat, barley) and 2.3% of the legume production depends on earthworms.