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The earthworms has 4 seate's on each segment.
Except for the first and last segments, which have no setae, there are eight tiny bristle-like structures that can not be seen with the naked eye called setae on each segment of an earthworm. The arrangement of the setae is one factor that helps in the identification of earthworms, as they can be closely or widely paired in four pairs or separate. Setae grip the soil to help the earthworm move about and sense the enviroment.
they have 4 of them on each segment
Just the two of them at each end of the line segment.
2
Any line segment has infinitely many points and each one of them is specific to that line segment.
annelids-derived from the latin word annellus which means little ring the name refers to the ring-like appearance of annelids' body segments. The body of an annelid is divided into segments that are separated by septa (singular: Septum), which are internal walls between each segment. Most segments are similar to one another, although they may be modified to preform special functions. Some body segments may carry one or more pairs of eyes, several pairs of antennae, and other sense organs. Other segments may be specialized for functions such as respiration. In many annelids, bristles called setae (singular: Setae) are attached to each segment.
Millipedes have two pairs of legs per body segment.
I want to say 2, once at each corner
1 in each broadcast segment
Zero times.
Many organisms benefit from setae, which are small, hair-like structures. In insects, setae help with movement and sense the surroundings. In earthworms, setae assist with locomotion by gripping the ground. Similarly, setae in spiders aid in capturing prey and creating a web.