Select the word from the list that best fits the definition smoking contributes to air pollution. a. too narrow b. too broad c. just right

I believe the answer is: B. Too broad

As a general rule, a definition is considered as 'too broad' if the definition contain things that are not referents of the concept or does not necessarily explain why it's correlated with the concept. In the statement above, the writer of that statement did not include how or in what way smoking contributes to the air pollution.

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.'