Trade between two countries can benefit both countries if
A) each country exports that good in which it has a comparative advantage. B) each country enjoys superior terms of trade. C) each country has a more elastic demand for the imported goods. D) each country has a more elastic supply for the exported goods. E) each country produces a wide range of goods for export.

Option (A) is correct.

Explanation:

According to the law of comparative advantage, a country or a nation has a comparative advantage in the production of a particular commodity if the opportunity cost of producing that commodity is lower than the other nation in terms of other commodity.

Comparative advantage is because of the difference in the factor endowments among the nations.

A country is exporting a commodity whose production requires the intensive use of the relatively abundant factor and in which it has a comparative advantage.

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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.'