Final answer:
The argument that best supports the claim about the body's functioning is that the organ systems work to obtain nutrients and eliminate waste, as it directly relates to the necessity of free energy in living systems.
Step-by-step explanation:
When preparing an argument to support a claim in a class debate, it's essential to choose evidence that directly backs the assertion being made. In this case, the argument that best supports the claim concerning the human body maintaining organization and managing waste would be:
'The body's organ systems work to obtain nutrients from food and eliminate waste.'
This statement is solid because it ties directly into the understanding that all living systems require a constant input of free energy for physiological functions, such as maintaining organization, growth, and reproduction. Furthermore, it aligns with the biological concepts that the organ systems, including the cardiovascular and respiratory systems, work together to deliver oxygen and nutrients to cells and remove waste products like carbon dioxide.