what kind of nervous system does it have?
Central nervous system
Earthworm
CNS 
name two small animals that have their homes in the soil Earthworms and Snails what is a habitat? It is the type of natural environment in which a particular species of organism lives. how are environmental factors related to it? Animal communities are reliant on specific types of plant communities. how many different types are there? Terrestrial habitat, Freshwater habitats, Marine habitats, deserts which favours the presence of amphibians etc can you please give an example of the environmental factors that you mentioned Terrestrial habitat types include forests, grasslands, wetlands and deserts, Freshwater include rivers, streams, lakes, ponds, marshes etc, Marine include brackish water, estuaries, bays, the open sea, the intertidal zone and further variations include rock pools, sand banks, mudflats etc. and what about the second type? They  include rivers, streams, lakes, ponds, marshes and bogs. are there microhabitats? Yes, every habitat includes large numbers of microhabitats. how does the first animal that lives in the soil move? They crawl faster primarily by taking longer "strides" and a greater frequency of strides. what kind of regeneration abilities does it have? They have the ability to regenerate lost segments, but this ability varies between species and depends on the extent of the damage. what economic impact does it have? They are used in vermiculture, the practice of feeding organic waste to earthworms to decompose food waste. has it ever been considered as an invasive species? From a total of around 7,000 species, only about 150 species are widely distributed around the world.
wiki:16879841
Earthworm [SEP] Central nervous system
The CNS consists of a bilobed brain (cerebral ganglia, or supra-pharyngeal ganglion), sub-pharyngeal ganglia, circum-pharyngeal connectives and a ventral nerve cord. Earthworms' brains consist of a pair of pear-shaped cerebral ganglia. These are located in the dorsal side of the alimentary canal in the third segment, in a groove between the buccal cavity and pharynx. A pair of circum-pharyngeal connectives from the brain encircle the pharynx and then connect with a pair of sub-pharyngeal ganglia located below the pharynx in the fourth segment. This arrangement means the brain, sub-pharyngeal ganglia and the circum-pharyngeal connectives form a nerve ring around the pharynx.