Answer: I'd say C 
Explanation: Small plants are at the bottom of the ecosystem, which means they have to start it out. I'm not sure tho.
 
        
             
        
        
        
Answer:
the salivary glands and the pancreas.
Explanation:
hope this helps
plz mark brainliest if correct
 
        
             
        
        
        
D) Blue Jays and Finches nest in the same Oak Trees.
Explanation:
This is an example of competition because two species are for the same thing, in this case, oak trees to nest in.
        
             
        
        
        
Of human genome codes for protein? 1 percent
        
                    
             
        
        
        
Answer:
C
Explanation:
They are 2 chemical properties creating a chemical reaction.