Actually, there are four kinds of reptile motion: 
Concertina - vermiform. Circular muscles around the snake squeeze the front of the snake's body out long, then the latter half is pulled forward. 
Rectilinear crawling - Belly scutes are moved forward individually in a wave-like motion. 
Side-winding - Snake's version of "walking". Use by several species to move over fluidic substrates, such as sand. 
Lateral undulation - Most common form of movement. Snake presses on alternating pressure points to force body forward (or backward)
(taken from a user on Yahoo from Correct Answers)
        
             
        
        
        
Answer:
<h3>... :-!...................nose...........</h3>
 
        
             
        
        
        
Answer:
Meteorites are consensually considered to be involved in the origin of life on this Planet for several functions and at different levels: (i) as providers of impact energy during their passage through the atmosphere; (ii) as agents of geodynamics, intended both as starters of the Earth’s tectonics and as activators of local hydrothermal systems upon their fall; (iii) as sources of organic materials, at varying levels of limited complexity; and (iv) as catalysts.
Explanation:
 
        
             
        
        
        
Oxygen and Sulfur are in the same group. 
Sulfur is the next element in the group, and it reacts with hydrogen gas (H2) in a manner similar to oxygen.