determine and explain what is causing marathon runners to collapse.

• Makes a clear claim about the problem

• Supports the claim with at least 2 quantitative evidences from the marathon runner data table.

• Identifies the external/internal stimuli and the internal responses

• Explains the physiological problem: What is happening in the runner's cells/ organs /organ systems before they collapse?

• Rules out at least 2 other studied homeostatic mechanisms with evidence from the marathon runner data table and explains how and why they are not the cause of the severe health condition.

• Establishes a concluding statement that supports the explanation presented that is not repetitive of the introductory statements.