Not every relation is a function. But every function is a relation. Function is just a part of relation.
The cubic function.
Range
A formula or graph are two ways to describe a math function. How a math function is described depends on the domain of the function or the complexity of the function.
The Mandelbrot graph is generated iteratively and so is a function of a function of a function ... and in that sense it is a composite function.
Earthworms do not have parapodia.
Parapodia are found on polychaete annelids, which are marine worms characterized by their numerous bristle-like extensions called chaetae on each body segment. These parapodia aid in locomotion and respiration.
Earthworms
Parapodia are paddle-like structures found on the sides of certain marine worms and mollusks. They are used for locomotion and breathing, with rows of setae (bristles) that help the organisms move through the water.
Phylum Annelida.
Parapodia are paired appendages found on polychetes, or marine worms, which are used for movement. Tube feet are found on echinoderms, like sea stars, which are also used for movement.
Parapodia in polychaetes serve as both respiratory structures and locomotory appendages. They increase surface area for gas exchange and help in swimming, crawling, and digging through the substrate, facilitating the active lifestyle of polychaetes.
Polychaetes have parapodia with chaetae for locomotion, have well-developed heads with sensory organs, exhibit a wider range of body forms, and primarily live in marine environments. Oligochaetes, on the other hand, lack parapodia and have fewer chaetae, have less specialized heads, mostly have a uniform body structure, and are mostly found in freshwater or terrestrial habitats.
Annelids breathe through their body wall and parapodia expands the surface area of the animal.Annelids, or earthworms, do not have lungs to breathe with. These creatures actually breathe through their skin and body wall.
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.
A nereis is a type of marine polychaete worm belonging to the family Nereididae. These worms can typically be found in intertidal zones and shallow marine waters around the world. They are known for their segmented bodies and bristle-like parapodia.
Function