On December 31, Westworld Incorporated has the following equity accounts and balances. Preferred Stock$ 8,900
Retained Earnings$ 54,500
Common Stock2,900
Paid-In Capital in Excess of Par Value, Common Stock40,900
Treasury Stock3,900
Paid-In Capital in Excess of Par Value, Preferred Stock4,900
Prepare the stockholders' equity section of Westworld's balance sheet. (Negative amount(s) should be indicated by a minus sign.)

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.'