C) Crops may cause an increase of allergic reactions in humans.
        
                    
             
        
        
        
The answer is because energy cannot be created or destroyed. 
hope this helps!
        
             
        
        
        
All the animals and plants that die as a result of their ecosystem being destroyed.
        
                    
             
        
        
        
Answer:
Vestigial structures
Explanation:
Vestigial structuresserve little or no present purpose for an organism. The human tail, which is reduced to the tailbone during development, is one example.
 
        
             
        
        
        
Answer:
 some important abiotic factors Space, water, and climate all help determine a species population.
Explanation: