It is better to evaluate economic decisions at the marginal, where the decision has to be made as long as its marginal benefit exceeds its marginal cost, if not equal to its marginal cost. A. True
B. False

True

Explanation:

Marginal benefit is the maximum amount that a consumer will be willing to pay for an extra product. It should be known that as consumption rises, the marginal benefit starts reducing.

The marginal cost is the extra cost that a producer incurs when an extra unit of a product is made. Economic decisions made by economic agents are typically based on marginal as it'll be possible to know the impact of an extra decision made on a variable.

Therefore, it is better to evaluate economic decisions at the marginal, where the decision has to be made as long as its marginal benefit exceeds its marginal cost, if not equal to its marginal cost.

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.'

answer; institution;