Which feature on this figure formed during the time when these two terranes joined? 
Definitions:
Effectors
Organs or cells that act in response to a stimulus, executing the required response in motor functions or other activities.
Nodes of Ranvier
Gaps in the myelin sheath of nerve fibers, which facilitate the rapid conduction of nerve impulses along the neuron.
Nerve Impulses
Electrical signals that travel along the axons of neurons, enabling communication within the nervous system.
Myelin Sheath
The protective coating around nerve fibers in the brain and spinal cord that helps increase the speed at which electrical impulses propagate along the nerve cells.
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