what are these?
They are sense organs distributed all over the epidermis of an Earthworm which contains columnar receptor cells.
Earthworm
are abundant and distributed all over the epidermis
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. what kind of nervous system does it have? Central nervous system do they have sense organs? Yes, Epidermal receptors
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Earthworm [SEP] Epidermal receptor (Sense organ)
These receptors are abundant and distributed all over the epidermis. Each receptor shows a slightly elevated cuticle which covers a group of tall, slender and columnar receptor cells. These cells bear small hairlike processes at their outer ends and their inner ends are connected with nerve fibres. The epidermal receptors are tactile in function. They are also concerned with changes in temperature and respond to chemical stimuli. Earthworms are extremely sensitive to touch and mechanical vibration.