It’s 2, 4, and 6!!! Please mark me brainlest❤️
        
             
        
        
        
A feather floating through the air has more kinetic energy because the rock is not in motion its on the ground the feather is moving in the air at a pretty fast rate of speed.
        
             
        
        
        
The answer would be Igneous rocks, because of magma cooling
 
        
                    
             
        
        
        
5. System level 
6. Organ level
        
             
        
        
        
I'd use the library, the encyclopedia and the Internet.