Why did you write the last part I don’t get it I’m
        
             
        
        
        
Organisms are the biotic parts of an ecosystem.
        
             
        
        
        
Answer:
A. Chemical modification may allow for extended drug capacities such as expanded spectrum of activity and increased stability.
Explanation:
Any modification in antibiotic structure and chemical will affects its ability in a way to increase it capability of target microbes and act efficiently. These modification can increase half life and stability of the drug.   
 
        
             
        
        
        
Answer take one piece of the squirrels diet away and see if anything has changed, if not give it that part back and take something else. repeat till change happens if nothing happens then change hypothesis 
 
        
             
        
        
        
Onion skin is a plant cell. And your skin cell is a animal cell.
Basically as simple all the structures in animal cell can be found in plant cells. But plant cells has some extra structure and part where doesn't exist in animal cells.
In animal cell, it contains a cytoplasm, nucleus and a cell membrane.
But in plant cell, they have chloroplast, cell wall and vacuole in additional.