If the natural unemployment rate is 7 percent and the current unemployment rate is 5 percent, then the economy is

a. producing more Real GDP than it does at full employment.

Explanation:

Since in the given question it is mentioned that the natural unemployment is 7% and the current unemployemnt rate is 5%

So based on the above information when the present unemployment rate is lesser than the natural unemployment rate this implies that the economy is generating the more output as compared with the potential level

Therefore the correct option is a.

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.'