I am not completely sure about this one, but I found on the Internet that what is a condition required for the Hardy-Weinberg principle to be in effect is A) random mating occurs.
        
             
        
        
        
1. to restore dying cells 2. to repair damaged cells 3. to reproduce
        
                    
             
        
        
        
Answer:
An inherited life-threatening disorder that damages the lungs and digestive system.
Cystic fibrosis affects the cells that produce mucus, sweat and digestive juices. It causes these fluids to become thick and sticky. They then plug up tubes, ducts and passageways.
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Explanation:
 
        
             
        
        
        
Answer:
The scientific method
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Make an observation.
Ask a question.
Form a hypothesis, or testable explanation.
Make a prediction based on the hypothesis.
Test the prediction.
Iterate: use the results to make new hypotheses or prediction
Explanation
that's the scientific method but there are many example to how you use it in everyday life i.e the lights went out and you want to find out why, perhaps you didn't pay your bill or maybe the power went out.  then you would go through the steps to find out what happened
 
        
             
        
        
        
Answer
C. Electron transport chain