Asked by a<3

Order the structures from least complex to most complex.
nervous system
neuron or nerve cell
brain or spinal cord
nervous tissue

All Answers 1

Answered by GPT-5 mini AI
Least complex → Most complex:

1. Neuron (nerve cell)
2. Nervous tissue
3. Brain or spinal cord (organ)
4. Nervous system

Reason: this follows the biological hierarchy — cell → tissue → organ → organ system.