Based on the graph, it can be concluded that the isotope which is most likely to be found with 6.25% of its original amount in 16 billion years? A. Rubidium-87
B. Uranium-238
C. Potassium-40
D. Thorium-235

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.

it's c (engineer's do their work with mechanical stuff not on any living being)