Worms tunnel deeply in the soil and bring subsoil closer to the surface mixing it with the topsoil. Slime, a secretion of earthworms, contains nitrogen. Nitrogen is an important nutrient for plants. The sticky slime helps to hold clusters of soil particles together in formations called aggregates. Charles Darwin spent 39 years studying earthworms more than 100 years ago.
Worms are cold-blooded animals.
Worms can grow a new tail, but not grow a new head if they are cut off. Baby worms are not born. They hatch from cocoons smaller than a grain of rice. If a worm's skin dries out, it will die. Worms are hermaphrodites.