The correct sequence that lists an organism's levels of organization from the least to the most complex is B. neuron, nerve tissue, spinal cord, nervous system.
In this sequence:
- Neuron: The basic unit of the nervous system.
- Nerve tissue: A group of neurons working together.
- Spinal cord: A central structure in the nervous system made up of nerve tissues.
- Nervous system: The overall system that includes the spinal cord, brain, and all the nerves throughout the body.
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