There are only two brands of tennis balls Tom purchases: "Wilson" and "Penn." The more he purchases of a ball, the lower the marginal utility of that ball. He spends all of his income and his marginal utility of a "Wilson" is 6 and his marginal utility of an "Penn" is 12. The price of a "Wilson" ball is $1 and the price of an "Penn" is $2. Which of the statements is true based on the above information? A) Tom could increase his satisfaction by trading "Wilson" for "Penn."
B) In equilibrium, Tom must give up three "Penn" balls for two "Wilson" balls.
C) Tom would be willing to give up two "Penn" balls for one "Wilson" ball.
D) Tom can increase his satisfaction by doing nothing

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answer; i believe that the correct answer is client agreement;

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.'