Notice the unemployment data in these years: 1981-83, 1991-92 and 2008-10. Based on unemployment data in the chart and using your knowledge of Economic Cycles, what is happening during these years (i. e. 1981-83, 1991-93 and 2008-10)? How can you tell?

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.'