Aerobic respiration produces 38 ATP, while anaerobic respiration only produces 2 ATP. I hope that answered your question, my friend. :)
        
             
        
        
        
The organ that is important in processing substances after being absorbed during digestion is the liver.
        
             
        
        
        
Carbohydrates attached to lipids and to proteins extend from the outward facing surface to the membrane. The second factor that leads to fluidity is the nature of the phospholipids themselves
        
             
        
        
        
The DV is measured for results
        
             
        
        
        
Answer:
Biologists measure the number of trophic levels in an ecosystem so as to check its stability and health.
Explanation:
Trophic levels are the feeding position in a food chain such as primary producers, consumers, etc. They are positions that an organisms occupies in a food chain (series of steps in which organisms transfer energy by eating or being eaten);- what it eats and what eats it. 
Theoretically there is no any limit to the number of trophic levels in a food chain or number of organisms that live on each level.