The answer is d clinical deficiency
        
                    
             
        
        
        
We can confirm that a case study matches the description put forward by option C in the question statements in that it is used to study a single individual or group.
<h3 /><h3>What exactly is a case study?</h3>
In research, a case study is when a single individual or group is studied in great depth, as described by option C. Case studies are more often done in groups in order to better compare results between various groups and can be very useful in providing a deeper insight into behavior or patterns. 
Therefore, we can confirm that a case study is when a single individual or group is studied in great depth. Option C is correct. 
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Answer:
The responding (dependent) variable
Explanation:
In an experiment, one of the variables is either changed/maipulated or measured. The variable that is deliberately changed is called the INDEPENDENT VARIABLE while the variable that responds to the changes made to the independent variable, or is being measured is called DEPENDENT VARIABLE. 
Hence, in the experiment involving the height of the ramp and the speed of the skateboard, the SPEED OF THE SKATEBOARD IS THE DEPENDENT/RESPONDING VARIABLE because it is the variable being measured.
 
        
             
        
        
        
Lipids are the fats of our organic compounds.
        
                    
             
        
        
        
Groundwater is defined as the water present beneath the Earth's surface in rock and soil pores and in fractures of rock formations. 
 
<h3>What are Saturated and Unsaturated Zones of Groundwater?</h3>
 
- The saturated zone of groundwater refers to the zone in which pores and rock fractures are filled with water only. The top part of the saturated zone is referred to as the water table. 
- Unsaturated zone refers to the zone present below the saturated zone and consists of air and water pores. The soils and rocks are also found in this zone. It is not readily available water for human consumption. 
 
Thus, the saturated zone has water, while the unsaturated zone has soil, rock, and air with water. 
 
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