List the 4 characteristics of annelids?

Answer 1

they eat many things they can be scavengers, blood suckers , eat bacteria and they can eat decaying matter.

Annelids are worms that get their name from the Latin word meaning "ring" because their bodies are generally segmented,or divided into rings.There are about 9,000 species in there main grouping,

The annelids include earthworms, polychaete worms, and leeches. All members of the group are to some extent segmented, in other words, made up of segments that are formed by subdivisions that partially transect the body cavity. Segmentation is also called metamerism. Segments each contain elements of such body systems as circulatory, nervous, and excretory tracts. Metamerism increases the efficiency of body movement by allowing the effect of muscle contraction to be extremely localized, and it makes possible the development of greater complexity in general body organization.

Besides being segmented, the body wall of annelids is characterized by being made up of both circular and longitudinal muscle fibers surrounded by a moist, acellular cuticle that is secreted by an epidermal epithelium. All annelids except leeches also have chitonous hair-like structures, called setae, projecting from their cuticle. Sometimes the setae are located on paddle-like appendages called parapodia.

Earthworms include mainly ground-living burrowing worms.They help to make the soil fit for plants to grow in.They make burrows which keep the top layer of soil loose and fresh,and swallow soil which passes through their bodies and returns again to the soil in a form which can be easily absorbed by the roots of plants(see earthworm).The group also includes a freshwater types such as bright red bloodworms that live in mud and are used to feed aquarium fish.

Marine worms are a smaller group that live mainly in the sea.Either they swim or shimmy around rocks and feed on small animals(see Ragworm),or else they in tubes and extend their tentacles to catch plankton,or filter small animals from mud or sand.The worm casts found low down on sandy Atlantic beaches are formed by the lugworm.

Leeches make up the third group of segmented worms.There are only 300 known species.All feed on blood.

Answer 2

CHARACTERISTICS OF ANNELIDA ARE THE FOLLOWING:

Annelids are Billaterally and vermiform,their body has more than two cell layer,tissues and organs,their body cavity is a true coelom,often divided by internal septa.Annelids body posseses a through gut with mouth and anus,their body possesses 3 separate sections,a prosomium,a trunk and a pygidium,they also has a nervous system with an anterior nerve ring,ganglia and a ventral nerve chord.Also has a true closed circulatory systemand has no true respiratory organs.Their reproduction normally sexual and gonochoristic or hermapodic and they live in most environment.They are segmented both externally and internally, and have long round bodies