Why are cells are able to harvest about 34% of the available stored potential energy in a glucose molecule? What happens to the other 66%?

Why are cells are able to harvest about 34% of the available stored potential energy in a glucose molecule is because of  the process of cellular respiration. And what happens to the other 66% is that it's  used to make water from hydrogen ions and oxygen that converted to heat and used directly for energy to store as fat

Explanation:

an organism's phenotype is the  form of a trait  that it  displays. for  flowercolor, a pea  plant  can  display  a phenotype of purple or white flowers. an organism's  genotype  is the alleles of a gene it contains. based on his data, mendel concluded that a phenotype can be  determined  by more than one  genotype.

sheep is a herbivore animal whereas grasshopper belongs to the class chordates but both of them feed on greens.  

if grasshopper and sheep feeding on a pasture land, i do not think both of them will have any impact on each other. however, the number of the species can make difference. since sheep feed on greens, there is a possibility there left no pasture land for the grasshoppers or they may get extinct.