Measuring photosynthesis via the production of oxygen. Oxygen can be measured by counting bubbles evolved from pondweed, or by using the Audus apparatus to measure the amount of gas evolved over a period of time.
The answer is A it's the action of purifying water
B. Because they don’t want to see the patients real reaction to the medication to see if it is actually effective
Eustress: m<span>oderate psychological stress interpreted as being beneficial for the experiencer.</span>
