Answer:
a. pepsin 
Explanation:
it has a 1 to 2 level which is acidic because anything lower than 7 is acidic
 
        
                    
             
        
        
        
The answer is a population.
        
                    
             
        
        
        
Carbon and nitrogen and an important element of living things. Nitrogen is a major component of DNA and amino acids while carbon can be found in almost all biomolecules. These elements, therefore, need to be renewed and recycled as they are utilized by ecosystems that is ever dynamic.  
 
        
             
        
        
        
Answer:
A- I have not idea sorry!
B- Looks like a vacuole 
C- Cell membrane
D- Endoplasmic Reticulum
Explanation:
 
        
             
        
        
        
The wind will blow from the higher pressure over the water to lower pressure over the land causing the sea breeze.
This causes the low surface pressure to shift to over the ocean during the night and the high surface pressure to move over the land.
<h2><u><em>
Air above land warms quicker than air over water.</em></u></h2>