Consider mandy’s decision to go to college. if she goes to college, she will spend $20,000 on tuition, $10,000 on room and board, and $2,000 on books. if she does not go to college, she will earn $18,000 working in a store and spend $8,000 on room and board. mandy’s cost of going to college is

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.'