Starch is present in saliva. 
I don't know which food choice you made so I can't explain why you got the results you did.
        
                    
             
        
        
        
Answer: ONLY CERTAIN SUBSTANCES CAN PASS THROUGH IT
Explanation: 
1 only gases and water can pass through it.
2 substances need permission to pass through it.
3 only certain substances can pass through it.
4 substances need carrier molecules to pass through it.
5 ATP is always needed to move molecules across the plasma membrane.
 
        
             
        
        
        
decreased primary consumer
 
        
                    
             
        
        
        
Number 1 is C
And im not sure about the rest :(