I would go with mathmatical formula because of physics and what not but I'm not completely sure so if you have a different possible answer you think would be better, go with that :)
        
                    
             
        
        
        
A tree is considered living because it takes in nutrients like other living things. The tree is also made up of cells which all living things are made up of. Trees can also produce offspring. Just like any other living thing.
        
             
        
        
        
"The rotating part of the microscope at the bottom of the body tube; it holds the objectives." -utahscience.oremjr.alpine.k12.ut.us
        
             
        
        
        
It can big increase speed and change direction