Fact 1: Neurons are the structural and functional units of the nervous system.

Fact 2: Connections can be made neuron to neuron or neuron to axon.

Given the two facts above, answer the question "What are connected to structural and functional units of the nervous system?" with the following options: 
- eardrum
 - axons
 - bacteria
 - cilia
 - organ
 - motors
 - skin cells
 - nerves


 

  axons       