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Not every relation is a function. But every function is a relation. Function is just a part of relation.
The cubic function.
Range
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.
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.
For grasping, feeding and piercing it's prey
The subphylum Chelicerata is characterized by animals lacking antennae. This group includes spiders, scorpions, ticks, and mites. Instead of antennae, chelicerates have structures called chelicerae, which are used for feeding and defense.
no chelicerates are mostly spiders or scorpions or horseshoe crabs
Arachnids such as spiders and scorpions have chelicerae.
No
chelicerates
A spider uses its chelicerae to catch its prey by stabbing it and injecting venom into it.
Spiders are chelicerates and therefore arthropods.[6] As arthropods they have: segmented bodies with jointed limbs, all covered in a cuticle made of chitin and proteins; heads that are composed of several segments that fuse during the development of the embryo.[5] Being chelicerates, their bodies consist of two tagmata, sets of segments that serve similar functions: the foremost one, called the cephalothorax or prosoma, is a complete fusion of the segments that in an insect would form two separate tagmata, the head and thorax; the rear tagma is called the abdomen or opisthosoma.[6] In spiders the cephalothorax and abdomen are connected by a small cylindrical section, the pedicel.[7] The pattern of segment fusion that forms chelicerates' heads is unique among arthropods, and what would normally be the first head segment disappears at an early stage of development, so that chelicerates lack the antennae typical of most arthropods. In fact chelicerates' only appendages ahead of the mouth are a pair of chelicerae, and they lack anything that would function directly as "jaws".[5][8] The first appendages behind the mouth are called pedipalps, and serve different functions within different groups of chelicerates.[6
3
The prey is captured by the pedipalps and the sting is inserted in it, the paralyzed or killed prey is sucked using the chelicerae.
3
chelicerates