Suppose that a steel factory emits a certain amount of air pollution, which constitutes a negative externality. if the market does not internalize the externality, a. consumers will be required to pay a higher price for steel than they would have if the externality were internalized. b. producers will produce less steel than they otherwise would if the externality were internalized. c. the supply curve would adequately reflect the marginal social cost of production. d. the market equilibrium quantity will not be the socially optimal quantity.

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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