I think that the bright light would be the "stimulus" and the pupil constricting would be the "response".
The gram is the basic unit of mass.
I think it is inflamation, but not entirly shure
Answer:
The electron transport chain is a cluster of proteins that transfer electrons through a membrane to create a gradient of protons that creates ATP (adenosine triphosphate) or energy that is needed in metabolic processes for cellular function.
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