Country A had a population of 2,000, of whom 1,300 worked an average of 8 hours a day and had a productivity of 5. Country B had a population of 2,500, of whom 1,700 worked 8 hours a day and had productivity of 4. Country a. A had the higher level of real GDP and real GDP per person. b. A had the higher level of real GDP and Country B had the higher level of real GDP per person c. B had the higher level of real GDP and Country A had the higher level of real GDP per person d. B had the higher level of real GDP and real GDP per person.

Country

Explanation:

Country A's population 2,000, worked 1,300 with 8 hours a day with a productivity of 5 = 52,000 units of something produced. GDP per capita = 52,000 / 2,000 = 26 per capita

Country B's population 2,500, worked 1,700 with 8 hours a day with a productivity of 4 = 54,400 units of something produced. GDP per capita = 54,400 / 2,500 = 21.76 per capita

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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.'