Earthworms, which are a type of segmented worm, help out plans by digging tunnels in the soil which gives plants oxygen.
They are useful because worms chew your food and turn it into garden fertilizer.
They eat worms
worms,ladybirds and loads more
You can use them for fishing bait.
Well if you mean what use are worms then they are useful for compost and aerating the soil for plants to grow
Yes, they can help make clothes.
they can help your gardens grow and heaps more
Worms dig through soil and Airate (make passages for oxygen to pass) the soil. They also add biological matter to the soil.
aerate the soil, breakdown leaves and grass into compost, fertilize the soil with their droppings
Some useful insects are worms because they help the soil.
Worms are not suitable for aquarium soil, consider how worms come to the surface when it is wet, they actually are preventing themselves from drowning. So earthworms will not work, not to mention they eat rotting and decomposing matter, which, for the most part, the aquarium soil is lacking.
They're advanced over their ancestors - worms - by having that new and useful sructure, the articulated leg.