Answer:
IV: Student grade level (6th, 7th, 8th)
DV: "Loudness" (Operationalizing this variable would be beneficial, or in other words, define a way to measure it)
Explanation:
 
        
             
        
        
        
Answer: Cerebellum
Explanation: We have to elimnate the other answers to figure out which one is correct. 
The brain stem is number six
The spinal cord is also number six, but way lower
The cerebrum is like the whole brain
Therefore, leaving us with cerebellum, cerebellum is the correct answer
 
        
                    
             
        
        
        
The process by which different kinds of living organisms are thought to have developed and diversified from earlier forms during the history of the earth.
        
                    
             
        
        
        
Answer:
The amount of energy in the first level determines how many animals can be supported on the subsequent levels.
The first level of the energy pyramid usually consists of the producers which are the main source of energy for a food web or a food chain. They determine that how many number of species can be supported by the particular ecosystems at each subsequent levels of the energy pyramid. They are the main source through which energy arises in an ecosystem. 
 
        
             
        
        
        
C. It’s the process of Burning something