how are they important for the environment?
Contribute to soil fertility and important prey for birds.
Annelid
earthworms' contributions to soil fertility. Some burrow while others live entirely on the surface, generally in moist leaf litter. The burrowers loosen the soil so that oxygen and water can penetrate it, and both surface and burrowing worms help to produce soil by mixing organic and mineral matter, by accelerating the decomposition of organic matter and thus making it more quickly available to other organisms, and by concentrating minerals and converting them to forms that plants can use more easily. Earthworms are also important prey for birds ranging in size from robins to storks, and for mammals ranging from shrews to badgers, and in some cases conserving earthworms may be essential for conserving endangered birds.
what is ocean sunfish? One of the heaviest known bony fishes in the world. what do they survive on? Small fish, fish larvae, squid, and crustaceans, etc. what is the last one? Large and diverse arthropod taxon. can the term that you just mentioned be classified? Yes, subdivided into five subphyla. can you name any? UNANSWERABLE where do these creatures get their name from? Greek "árthron" and "pous" could you please describe them? Invertebrates with segmented bodies and jointed limbs. can you state a feature of the term that you just mentioned? Absence of a vertebral column (backbone) how do they reproduce? They reproduce at least partly through sexual reproduction. could you please give a few examples of this group? Arthropods, mollusks, annelid, and cnidarians. how do the third one respire? Via skin and gills.
wiki:19305432
Annelid [SEP] Ecological significance
Charles Darwin's book "The Formation of Vegetable Mould through the Action of Worms" (1881) presented the first scientific analysis of earthworms' contributions to soil fertility. Some burrow while others live entirely on the surface, generally in moist leaf litter. The burrowers loosen the soil so that oxygen and water can penetrate it, and both surface and burrowing worms help to produce soil by mixing organic and mineral matter, by accelerating the decomposition of organic matter and thus making it more quickly available to other organisms, and by concentrating minerals and converting them to forms that plants can use more easily.