ERGONOMIC keyboards such as "Microsoft Natural Keyboard" can help prevent injuries from using the keyboard for long periods of time. Posture related injuries result from long use of laptops and computers. The ergonomic keyboards are easily adjustable by adjusting height in a particular angle.  
        
                    
             
        
        
        
Photosynthesis:
   1) Reactants = CO2, Water, Sunlight
   2) Products   = O2, Glucose, 
Cellular Respiration:
   1) Reactants = O2, Glucose
   2) Products   = CO2, Energy (in ATP)
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gg is genotype and phenotype white
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Answer:
D. The skin 
Explanation:
The skin is usually considered as supply-independent for oxygen delivery. The most affected organs and tissues considered as being supply-dependent for oxygen delivery are heart, brain and lungs. These are the most sensitive to oxygen deprivation, being the brain more than the other organs.