What substrates or products might you monitor to determine the rate of photosynthesis?

You could put a plant in a plastic bag and monitor the CO2 concentration in the bag.

thrombocytopenia, which is a deficiency in blood platelets, can cause bleeding and bruising in the dermis similar to senile purpura. other possible causes include: exposure to ultraviolet rays and aging skin are common causes of senile purpura. senile purpura may also be a sign of collagen loss in the skin and bones.