activities of living organisms (animals, burrows, plant roots), pressure from overlying load/materials and atmospheric conditions.
Answer:
gravity is your answer my friend
Tachycardia is a condition when the heart rate is greater than 100 beats per min at rest. The electrocardiogram is a diagnostic tool that measures and records the electrical activity of the heart. Bradycardia on the other hand is when the heart rate is slower than normal. The Tachycardia and bradycardia can arise from either the SA node or from other areas of the cardiac.
There are only so many resources that can be used and if all of them are used they don't have enough materials or food.
