It's the mitochondria, the "powerhouse of the cell".
Pretty sure the answer is Sugar, Correct me if I'm wrong
Mitochondria produce ATP<span> by </span>respiration<span> and the Kreb's cycle. If you want some extra credit, the cytoplasm of a </span>cell<span> (the fluid </span>cellular<span> matrix) also </span>produces ATP<span>, but by glycolysis.</span>
B is the answer to your question
The remains or impression of a prehistoric living organism preserved in a mold or petrified.
Hope this helps!