D Would Be The Best Choice
D is the correct answer. (Panting in a dogs increases the amount of cool air in nasal passages and lowers body temp).
<span>Energy must constantly flow through an ecosystem for the system to remain stable.</span> it means that organisms must eat other organisms
<span>Meditation decreases sympathetic nervous system activity. A myocaridial infraction is just another word for heart attack and the sympathetic nervous system can play a role in causing a heart attack. The sympathetic nervous system can increase your blood pressure, heart rate, both of which can cause a heart attack, so meditation can keep these things at a low level.</span>
