The circulatory system - hemoglobin in the blood transports oxygen :)
        
             
        
        
        
Phytoplankton contribute positively in the oceanic ecosystem as they are a source of food for oceanic animals. Moreover, they remove carbondioxide from the carbon cycle and utilize it for the process of photosynthesis.
        
             
        
        
        
The correct answer is: creative thinking.
Creative thinking means being able to consider and come up with something new. Creative thinking is a skill of an individual to perceive patterns that are not obvious and to solve problems in a new different way.
 
        
                    
             
        
        
        
  Bacteria can replicate themselves.