air, water, and plant roots.
tunnels
an earthworm makes tunnels in the ground and keeps it moist.So it wont dry out.
It has just over 151.34 miles (243.56 km) of mapped passageways.
because when dig tunnels soil gets air water etc
It is because the house was a stop in the moving of slaves. The passageways helped keep the slaves safe from the slave catchers or bounty hunters who wanted to return them to their slave owner
deep mining
Spinal Nerves
provide passageways for spinal nerves that proceed between joining vertebrae and connect to the spinal cord.
Tunnels are long underground passageways that carry highways, railroads, and pipelines under mountains, seas, and rivers.The tunnel was drilled right through the mountains so cars and trucks could pass through. Tunnels can be built underground to carry people. Tunnels are also built to carry waste water away from the city.
Caves! As simple as that. And the passageways are just "passages", believe it or not - though that is a generic term for different passage types have their own technical names (apart from any lyrical names for individual ones).
Yes because they like to have a vertical envelope as well as a horizontal one, so in danger it will flee any way it can like tunnels, burrows, and small passageways.
Blasting tunnels through mountains was necessary to create passageways for transportation, such as roads, railways, and waterways. Without tunnels, travel through mountainous areas would be difficult and time-consuming, impacting trade, commerce, and connectivity between regions. Tunnels also provided access to resources located within mountains, such as minerals and water sources.