Spider. You measure a heartbeat of 50 beats/min in a small 250 mg spider in your lab. You step out of the building and see an inflatable Halloween spider. You estimate that the weight would be 250 kg, if a spider of that size would exist. What would be the heartbeat of such a creature? Along your way doing the calculation you may need 250-1/4 = 0.25 and 250000000-1/4 = 0.008

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