Simple, Your BRAIN can only process so much, so the signal to your vocal cords and tongue slow and You mess up Example:
 
SAY PETER Piper picked a pack a pickle peppers 8x 
Did you mess up? I bet so 
also here an easy one. RUBER BABY BUGGY BUMPER  
        
             
        
        
        
Briefly, one can categorize the 3 types of boundaries as so: At convergent boundaries, the two tectonic plates are coming closer to each other; at divergent boundaries they are increasing they move away from each other and at transform boundaries the plates are moving parallel to their boundary. Based on this, all boundaries will be divergent boundaries.
        
             
        
        
        
When a doctor refuses to care for a certain patient. This can be for numerous reasons, maybe they are not fit to undergo a surgery of some sort, or are being problematic. Either or the doctor nor the patient benefit form this. Doctor misses out on someone to help (i assume that’s the attitude of one working for the greater good) and the patient misses the opportunity to possibly get the help they need.
        
             
        
        
        
It's letter c i believe, because they need the DNA's instruction on how to copy the exact tissue copy.