Several strategies are apparent to assist with gas exchange upon which respiration depends. For insects, a system of tubules connects from spiracles or openings on the exoskeleton, through the trachea and smaller tracheoles connected directly to the tissues. Arachnids may use book lungs, layered book-shaped structures for gas exchange. Terrestrial crustaceans like crabs may use gills so long as they stay moist. Woodlice on land breath through trachea-like lungs in their hind legs called pleopodal lungs, but they too lose water rapidly and need to inhabit damp places.
Gill
Tracheal tubes
tracheal tubes
They have a mouth and an anus like most higher organisms for solid food waste. Gaseous waste for terrestrial arthropods passes through microscopic tubules (tracheoles) and out pairs of openings in body segments (the spiracles); for aquatic arthropods, gills are used to remove nitrogenous waste - particularly useful for highly toxic ammonia.
No, It is not used for respiration instead it is used for the movement or locomotion of body.
terrestrial
The brushlike structures on a polychaete body are called parapodia. They are used for locomotion, respiration, and sometimes for feeding in many species of polychaetes, which are a type of marine annelid worm.
The commonest arthropod structures for extracting oxygen from water would be gills, are protected inside a body cavity with ventral openings; rarely, simpler book gills are used (as in horseshoe crabs). Most crustaceans assist water movement across the gills with special structures called gill bailers. Smaller arthropods like copepods lack gills and absorb oxygen directly into their bodies. Some insects acquire oxygen using a gas diffusion method from a thin body air layer underwater (replenishing oxygen from water) and have the same structures as terrestrial insects, namely, spiracles, trachea, etc.
No, worms are not arthropods because they do not have a shell. All arthropods have an external shell or an exoskeleton which is used to define them or classify them.
There is direct relationship between the habitat of the organism and the respiratory structures used for gas exchange. Animals that live in water use gills while those on land may use the tracheal or lungs for respiration.
Mandibles are jaws and are used for eating.
can be changed into glucose and used in cellular respiration.