The answer is true, they are only single celled!
        
             
        
        
        
The pressure will decrease when valve in the right flow tube become leaky.
<h3>What is Pressure?</h3>
This is defined as the force per unit area of a substance.  Volume is directly proportional to the pressure of a substance.
When there is a leakage, the volume decreases which leads to a corresponding decrease in the pressure.
Read more about Pressure here brainly.com/question/25736513
 
        
             
        
        
        
Answer:
Land Insecurity 
Very Poor Living Conditions
Unemployment
Crime. 
To name a few
 
        
                    
             
        
        
        
Largest- Oak trees Smallest- Toads
        
             
        
        
        
Human because human is the only organism on the list!