Topography is the answer :)
Cardiac Output. Cardiac Output (CO) is the amount of blood pumped by the heart per unit of time and it depends on 2 important variables like below, Stroke Volume (SV) = the amount of blood ejected per beat of the heart (Normally, 70 ml/beat). Heart rate (HR) = heart beats per minute (normally, 70 beats/min).
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earthquakes, volcanoes and tsunamis all result because of plate tectonics
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Sunlight stimulates the growth of phytoplanktons which belong to the first trophic level in an aquatic ecosystem pyramid. If these do not exist, aquatic ecosystem would also disappear.