Which of the following statements is false? when marginal cost is less than average total cost, average total cost will fall. marginal cost will equal average total cost when marginal cost is at its lowest point. when marginal cost is greater than average total cost, average total cost will rise. marginal cost will equal average total cost when average total cost is at its lowest point.

ans.

heterothermic organisms include those organisms that can switch between homeothermic (having body temperature higher than environment) and poikilothermic (having variation in internal body temperature) strategies.

some migratory birds show heterothermy as they decrease their metabolic rate during cold nights to keep their body temperature low. drop in metabolic rate allows increase in production efficiency of birds that reduces the internal body temperature to make it equal to external cold temperature during cold nights.

thus, the correct answer is 'birds allow their temperature drop in order to increase their production efficiency.'