Answer:
Nerve cell → Nerve Tissue → Brain → Nervous System
Step-by-step explanation:
Nerve cells also known as Neurons are the active constituent of the nervous system and they are structurally different from other cell types. Their major job is sending and receiving signals from the brain.
Nerve Tissue is a special kind of tissue found in the central nervous system and the peripheral nervous system. The nervous tissue is responsible for coordinating majority of body activities.
The Brain is the central organ of the nervous system. It is composed of above 100 billion nerves that communicate.
The Nervous System is a system made up of an assembly of nerves and cells that control all body functions. It is made up of the brain and spinal cord.
Therefore, this is the correct sequence of the levels of organization;
Nerve cell → Nerve Tissue → Brain → Nervous System