According to the mundell–fleming model, in an economy with flexible exchange rates, expansionary fiscal policy causes net exports to and expansionary monetary policy causes net exports to

Decrease and Increase

Explanation:

According to the Mundell–Fleming model, in an economy with flexible exchange rates, expansionary fiscal policy will cause the net exports to decrease. Expansionary fiscal policy shifts the IS curve rightwards, as a result BOP surplus created in the economy. So, exchange rate decreases to shift the BOP back to its initial position. As a result of lower exchange rate, exports falls. Hence, net exports decreases.

Expansionary Monetary policy will cause the net exports to increases. Expansionary Monetary policy shifts the LM curve rightwards, as a result BOP deficit created in the economy. So, exchange rate increases to shift the BOP back to its initial position. As a result of higher exchange rate, exports increases. Hence, net exports increases.

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.'

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