A branch or leaf and here is a link to some flash cards i found 
https://quizlet.com/45759526/developmental-anatomy-flash-cards/
        
             
        
        
        
Answer:
C. electricity generation
Explanation:
 
        
                    
             
        
        
        
Answer:
population expansion decreases as resources become scarce, leveling off when the carrying capacity of the environment is reached, resulting in an S-shaped curve.
Explanation:
 
        
             
        
        
        
Answer:
B. Putting the bacterium through a mass spectrometer.
Explanation:
FOR OBSERVATION AND TO CHECK THE RECOMBINANT DNA PROCESS WE HAVE TO THE OBSERVE THE REPLICATION PROCESS OF BACTERIA.
 
        
             
        
        
        
The answer choices are not provided, so I cannot select the correct one. However, I may provide you examples and guidance on how to choose the correct one.
As mentioned in the explanation, a scientific question must have a variable that is changed, the independent variable, and a variable on which the effect of the change is measured. This is the dependent variable. Examples of such questions include:
How will the amount of water given to a plant affect its rate of growth?
What will be the amount of sugar that can be dissolved in water at a given temperature?
At what temperature will a balloon filled with air pop?
All of these questions may be tested using experiments.