<span>A stimulant like caffeine etc is used to boost activity in certain areas of brain.</span>
Answer:
the answer is C
Explanation:
Stomata are pores localized in the plant epidermis whose function is to regulate gas exchange between plants and the atmosphere. Generally, stomata open during the day to allow the diffusion of carbon dioxide (CO2) and close during the night to avoid water loss (i.e., transpiration). On the other hand, CAM plants photosynthesize during the day, and exchange gases (CO2 and O2) during the night. Thus, desert CAM plants open their stomata during the night and close them during the day hours. These desert plants open stomata at night to absorb CO2 and close them during sunlight hours to prevent transpiration.
The term used to describe the organisms overall attempt at maintaining balance or equilibrium of it's internal environment is called Homeostasis.
Political Action Committee (PAC) — A popular term for a political committee organized for the purpose of raising and spending money to elect and defeat candidates. Most PACs represent business, labor or ideological interests. PACs can give $5,000 to a candidate committee per election (primary, general or special).
