Energy<span> is made from the </span>ATP molecule<span> to </span>do<span> work in the </span>cell<span> by a reaction that removes one of the phosphate-oxygen groups, leaving adenosine diphosphate (ADP). When the </span>ATP<span> converts to ADP, the </span>ATP<span> is said to be spent.</span>
I'm pretty sure it's D, I could be wrong but it seems like it's the most correct answer.
The answer to this is plants.
The beginning of the Eocene Epoch Era.