Snakes are well known for their sinuous, side-winding movements, but they can also move in a straight line, like a train through a tunnel. ... He surmised that it was specialised belly muscles that allowed the snake to move along without the use of its spine.
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Answer:
snake didn't move in straight line because it doesn't have legs
Snakes are well known for their sinuous, side-winding movements, but they can also move in a straight line, like a train through a tunnel. ... He surmised that it was specialised belly muscles that allowed the snake to move along without the use of its spine.