Let's think of it like this.  We have an energy crisis, but how can we solve it?  There are three steps.  First, we need to recognize that we HAVE a problem that needs to be fixed.  Then, we need to determine what's causing the problem.  Finally, we need to change how we act in order to solve the problem.  Now, let's look at the options.
Is A correct, leaving our behavior unchanged?  NO: if we know the cause of the problem, we still need to solve it!  What about B: the problems are ignored?  NO: you can't solve a problem unless you know it's a problem.  C?  NO: to solve a problem, you need to find out what's causing it.  Finally, let's look at D: behavior is changed after cause is identified.  This is correct: not only do we know why it's happening, but we're fixing it!
Answer: D
        
                    
             
        
        
        
Answer:
rex was covered in a coat of downy feathers
Explanation:
Some mammals did have hair but T. Rex mostly had feathers 
 
        
                    
             
        
        
        
SSRI stands for S<span>elective Serotonin Reuptake Inhibitor and it is a type of antidepressant medication.  These medications are used to treat depression, and have fewer side effects than other medications. 
</span><span>These group of drugs works primarily by interfering with the reabsorption of serotonin in the brain. Serotonin is linked to happiness and good feeling, so i</span><span>ncreased serotonin can help relieve depression. </span>
        
             
        
        
        
Answer:
C.) Experimental 
Explanation:
He conducts test to see which shoe helps him better, in so doing a experimental investigation
 
        
             
        
        
        
Answer:
(H) is the central vacuole! 
Hope this helps ❤️