Organs or skeletal elements of animals and organisms
When the circular muscles contract, the earthworm stretches, becoming longer and thinner. The earthworm uses its setae to anchor the front of its body in the soil. Now the longitudinal muscles contract and the earthworm becomes shorter and wider or it bends from one side to the other, pulling the body forward.
Answer: at the center of tectonic plates hope this helpsヾ(•ω•`)o
Explanation:
Arthopods because they are the kind of organism you are looking for!!
