Assume milk is used to produce ice cream. Ceteris paribus, a decrease in the price of milk will cause the equilibrium price of ice cream to:.a. Decrease and the equilibrium quantity of ice cream to increase. b. Increase and the equilibrium quantity of ice cream to increase. c. Decrease and the equilibrium quantity of ice cream to decrease. d. Increase and the equilibrium quantity of ice cream to decrease.

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.'

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