<span>Because the atmosphere is thinner, there would be less pressure keeping the heart at its current size and it would expand and become too large to work properly</span>
I think the correct answer from the choices listed above is option C/ One reason that a product does not always form is due to unfavorable geometry of the reactants involved. When the geometry is not good for substances to react then no reaction can occur although there is enough energy present.
These are the nitrogenous bases in a nucleotide. There are four, which you mentioned in the problem: adenine, thymine, guanine, and cytosine.
The other two parts of a nucleotide make up he backbone: sugar, deoxyribose (DNA=DEOXYRIBOnucleic acid) and the phosphate group.
Hope this helps!!
