It would be acceptable to have the selling price of a product just above the variable costs and expenses of making and selling it in: A) monopoly situations
B) both the short run and long run
C) the long run
D) the short run

B.both the short run and long run.

answer; /// the above statement is (true);

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.'