Answer:
Breathing or respiration involves the inhale of oxygen into the lungs and exhale of carbon dioxide into the atmosphere. Cellular respiration involves the breakdown of glucose into carbon dioxide and water in living cells which in turn releases energy.
Hope this helps!
 
        
             
        
        
        
essential amino acids.
the "essential" refers to it being necessary to derive them from the foods we eat, but in fact the amino acids that the body produces are just as essential to the proper functioning and health of our bodies.
 
        
                    
             
        
        
        
The correct answer is option D, difficulty of redesigning workable ecosystems
Reason - 
The area that was redesigned into an ecosystem actually failed to attract the endangered species of clapper rails in California because of the following two reasons –
a)	Failed attempt of restoration of Cord grass ( a tree which is a dominant tree in the nesting habitat of clapper rail) . Even if few such trees were there they could not grow to their full height and thus were incapable of providing adequate nesting cover
b)	Due to the lack of predatory insect, some herbivore insect in the ecosystem attacked the green grasses thereby making the nesting inadequate.
 
        
             
        
        
        
That is not the correct answer