Experts say that most earthworms were imported from Europe to North America by settlers. To stabilize their ships, settlers loaded them with soil that contained earthworms and their cocoons. Glaciers had destroyed most native worm species in North America. Worms hatch from eggs or cocoons.
Earthworms are not the only kind of worm. In general, worms are small animals with a long, soft body lacking appendages. A worm is also the immature form of some insects. Parasitic worms live in the intestines of animals and feed off nutrients there. A person undeserving of respect may be called a worm, as may invasive computer programs.Learn More
Arthropods, such as insects, shrimps, spiders, centipedes, crayfish, scorpions and millipedes, are the most diverse group of animals in the world. They can be seen on land, in the air and in the sea and are classified under the phylum Arthropoda. Many arthropods remain undiscovered, and the number of species in the largest arthropod class, insects, is assumed to be in the tens of millions.Full Answer >
Among flatworms with a distinguishable excretory system, the usual method for voiding waste is through flame cells that are arrayed along the sides of the worms' bodies and connected to main ducts that drain its tissues directly. Many flatworms lack a complete digestive system, as their primary method of extracting nutrients from the environment is simply to absorb them through their skin.Full Answer >
Earthworms consume decaying vegetation and small particles of organic matter from the soil. Their primary diet is made up of leaf litter and other cast-off pieces of plants. Although they are important decomposers, they generally do not eat rotten meat or dairy.Full Answer >
Segmented worms have multiple segments that make them bilaterally symmetrical. Each segment houses an entire set of organs. Earthworms, ragworms and leeches are some of the 22,000 species of segmented worms. Capable of living in a variety of environments, segmented worms are an extremely viable group of animals.Full Answer >