An abscessed tooth is an infection within a tooth that has spread to the root tip or around the root. This infection originates from the tooth's inner chamber, which is called the pulp chamber.. Contained within the pulp chamber are blood vessels and nerves, collectively called the pulp..
Earthworms prefer to eat at night, though, rather than in the day. That is why they are also called nightcrawlers. Besides adding nutrients to the soil, earthworms keep the soil healthy by tunneling. Worms do not have claws or paws to make tunnels, but they do have mouths. As they eat (and eat and eat), they create tunnels that keep the soil open and full of paths for water and air.
Without soil microorganisms, insects, and worms feeding on organic matter, the nutrients in organic matter would remain bound in complex organic molecules that plants canât utilize. Second, as soil organisms break down organic matter, their activities help improve soil structure. The bacteria contain more nitrogen than the protozoa can utilize and some ammonium (NH4) is released to plants. 2  Protozoa also prevent some pathogens from establishing on plants and function as a food source for nematodes in the soil food web. 3  Nematodes â Nematodes are small, unsegmented round worms.