It is one of at least five forms of locomotion used by snakes, the others being lateral undulation, sidewinding, concertina movement, and slide-pushing. Unlike all other modes of snake locomotion, which include the snake bending its body, the snake flexes its body only when turning in rectilinear locomotion.
 
        
             
        
        
        
Realists believed that the information we have in the present is just an approximation of the fact, and it can be detailed in the future when the new information is discovered.
<h3>What is Realism?</h3>
Realism describes the physical things instead of dramatizing or romanticizing the things. Realism believes in facts and science instead of accepting mythological thoughts.
Realists, were practical and were free from any kind of subjective beliefs or ideas, according to them the knowledge has a scope of further discoveries and can be modified with the new knowledge. 
Therefore,  option 'D', 'realists', is correct.
Learn more about 'realists', here,
brainly.com/question/1225767
 
        
             
        
        
        
I would defiantly say false to that