Steven, a construction worker, tends to buy a new gadget if most of his friends have them. he relies on reviews from his friends rather than on television or newspaper advertisements to make his purchase decisions. it can be inferred that steven belongs to the category of in the diffusion of innovation.

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.'