By the heat of the enegry
Its conversion of pyruvate, a process where each molecule loses one carbon atom with the release of carbon dioxide
The generally widely accepted first step of the scientific method is to ask a question.
This is where you think of a question which you want to do an experiment on, and then later on conduct an experiment to answer that question.
I think the answer is b, because cartilage is what helps with flexibility in tissues....
B. Bacteria
The bacteria break the dead leaves down and release the nutrients back to the soil.