International are principles, norms, rules, and decision-making procedures around which there is a convergence of actors' expectations in an area of international relations.

regimes

Explanation:

Stephen David Krasner is an American academician and ex-diplomat who was born on the 15th of February, 1942 in New York, United States of America.

In 1981, Stephen was appointed as a professor of international relations at Standford University. Also, he is a senior fellow at the Freeman Spogli Institute (FSI), Stanford Institute for Economic Policy Research (SIEPR) and the Hoover Institution.

According to Stephen David Krasner, international regimes are composed of principles, norms, rules, and decision-making procedures around which there exist a convergence (meeting) of the expectations of various actors or leaders in an area of international relations.

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.'