How do worms dig their tunnels if their body is soft?
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They are eating the dirt and dirt is not generally packed too hard. They can move though it and eat it out of their way.
their body is mostly muscle, which can become hard when they need it to be hard. Elephant trunk is also all muscle, with no bones. But elephants can lift heavy things with it.
They may be soft but that actually aids them. They can use muscle mass to force their way through the ground and expand their bodies to create the tunnels. Have you seen how long worms can make themselves?
There is a video online showing what tiny little holes large octopi can escape through specifically because they’re soft and do not have a bone structure. Worms are similar.
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