The correct answer to this question is A, Earthworms. These animals are everywhere, even when we can't see them. Many are grossed out by earthworms, but they are essential and helpful to us all. They are also harmless. One reason why earthworms are crucial is that they are critical to the food chain.
They are also decomposers, and they are used in fertilizers, as well as useful for farmers. Earthworms also have many unique characteristics. For one, they don't have lungs, and they breathe through their skin. Another is that their bodies are covered in hairs that are tiny and small.
Earthworms are an example of segmented worms. The annelids, also known as the ringed worms or segmented worms, are a large phylum, with over 17,000 extant species including ragworms, earthworms, and leeches. The species exist in and have adapted to various ecologies – some in marine environments as distinct as tidal zones and hydrothermal vents, others in fresh water, and yet others in moist terrestrial environments.
The annelids are bilaterally symmetrical, triploblastic, coelomate, invertebrate organisms. They also have parapodia for locomotion. Although many species can reproduce asexually and use similar mechanisms to regenerate after severe injuries, sexual reproduction is the normal method in species whose reproduction has been studied.