C. because stimuli is how your body responds to something, and in this case, someone's heart rate increases WHEN their blood oxygen drop. Do you see how it responds? ;-)
Answer:
Either the cell wall or the cell membrane
Explanation:
Answer: Splitting the water
Explanation:
Carbon dioxide has a regulating function in the splitting of water in photosynthesis.
Solar energy provides the reducing power within green leaves to convert CO2 and H2O into sugars. ... During illumination, leaf cells have both a source (respiration) and sink (photosynthesis) for CO2. Respiration in some species appears to be greatly stimulated by light.