Answer:
This concept is called the theory of plate tectonics.
Explanation:
Technically this can be answered in a number of ways. But in elementary biology the cell is considered to be the basic unit of life.
Sensory neurons receive impulses and carry them from the sense organs to the spinal cord or brain. Interneurons connect sensory and motor neurons and interpret the impulse. Motor neurons carry impulses from the brain and spinal cord to muscles or glands. Draw and label the structure of a typical nerve cell.