1.) is circulatory system. An easy way to remember this is, blood circulates throughout the body, CIRCULatory. 
2.) Circulatory; resspiratory. 
HOpe i could help and this got to you in time! :)
 
        
                    
             
        
        
        
Answer:
D
Explanation:
The plants in the light formed bubbles because they released oxygen gas, This is because bubbles that are formed takes the places of oxygen molecules O2. Oxygen is released during photosynthesis through the process called light-dependent reaction.  The light-dependent reaction occurs only in the presencee of light. So, if bubbles formed are equivalent to oxygen molecules released in light-dependent reaction, then it is expected for bubbles to be found only on the leaves on those plants that were in a well-lit room.
 
        
             
        
        
        
In order to survive, all the cells in your body need energy. ... To provide this energy, your cells must break down the glucose in your food during a process called glycolysis and convert it into pyruvate<span>, sometimes called pyruvic acid, and the molecule that feeds the Krebs cycle, our second step in </span>cellular respiration<span>.</span>