Answer:
A. Oxygen
Explanation:
During cellular respiration the cell uses oxygen to break down sugar. When sugar breaks down it produces energy in which your body needs. Blood picks up oxygen and releses carbon dioxide into your lungs.
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Answer:
B. Continental glaciers can flow in all directions.
Explanation:
Continental glaciers flow outward in all directions from a central point.
The answer is b because everything else deals with population
Competition of resources, predation or disturbances (man-made and natural)
