The answer is backlighting
        
             
        
        
        
I would say it is considered as science and a bit of maths as its the 'study of abstract machines and automata'
        
                    
             
        
        
        
 <u>Efferent Neurons:</u> efferent neurons are motor neurons that carry neural impulses away from the central nervous systme and towards muscles to cause movement.
<u>Interneurons: </u> a neuron which transmits impulses between other neurons, especially as part of a reflex arc
<u>Astrocytes:</u> Astrocytes are the most numerous cell type within the central nervous system (CNS) and perform a variety of tasks, from axon guidance and synaptic support, to the control of the blood brain barrier and blood flow. To perform these roles, there is a great variety of astrocytes.
Explanation:
 
        
             
        
        
        
There have only been 3 Little Mermaid movies. 
<span>1. The Little Mermaid (1989) </span>
<span>2. The Little Mermaid 2 Return to the Sea (2000) </span>
<span>3. The Little Mermaid 3 Ariel's Beginning (2008)
hope this helps you(:
if not plz let me know (:
have a good day 
-denis</span>