Explanation:
The tropical rainforest is made up of a dense network of trees, shrubs and vegetation. 
This zone on earth is the most biodiverse on the earth surface. It receives the highest insolation of all places on earth and so radiant energy here is very high. 
- Due to this, the net productivity is very high. 
- This implies that a wide range of food is available to support the diverse organisms. 
- Also, the wet and dry seasons provides a very conducive weather for most organisms to survive.
Tundra and deserts have low precipitation and the conditions are very harsh. 
 
        
             
        
        
        
Climate is defined as an area's long-term weather patterns. The simplest way to describe climate is to look at average temperature and precipitation over time.
 
        
             
        
        
        
ok
 
        
                    
             
        
        
        
D. Lipids, Specifically Animal Fat
Reasoning - Behind the Lipids is that the chemical bonds can break faster and provide formula for the breakdown. 
 
        
        
        
Your answer would be A. Your welcome :)