Hello mate, 
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 may be ...All the information needed to mqke proteins is coded in DNA by ♢♢♢adenine, thymine, cytosine and guanine.
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I hope it will help you :-)
        
                    
             
        
        
        
One of the factor is the Sun's elevation where the UV reaches us at a much lower frequency when the sun is more distant. Next is our ozone, with our ozone depleting as time goes by, the amount of solar energy it can diffuse is much lesser thus the heat is much more than the previous decades.
        
                    
             
        
        
        
Homeostasis is the equilibrium of a cell.
Autotrophs make their own food through photosynthesis.
Mitochondria undergoes cellular respiration and is often referred to as the "powerhouse of the cell".
        
                    
             
        
        
        
Your answer would be $4 times $y.
Hope this helps; have a great day!