Answer:
Machines are faster and more efficent 
Explanation:
 
        
                    
             
        
        
        
Greetings!
The correct answer choice is Choice 4.
<em>Why?</em>
In a scientific experiment the only thing being changed is the independent variable. Everything else should stay the same. 
In this experiment, the independent variable is the amount of sunlight each plant should receive. <em>Here's a tip</em>- when looking for and independent variable look for whats being changed on purpose. 
Hope this helps!
~Fluerie
 
        
             
        
        
        
Answer
D. move a small magnet back and forth within a section of the coiled wire. 
Explanation:
i put that for the test and i got it right
 
        
                    
             
        
        
        
Yes it is possible. Spectrum of emitted light depends upon the chemical composition of the source. and the way of its excitation. a clear example to us is that of sun.
 
        
             
        
        
        
2,450 Joules,  kinetic energy is 1/2 mass x velocity squared.