Because bottled water is widely considered to be a purer choice then tap water, bottled water has become a billion-dollar-a-year business in the United states. Millions of consumers use bottled water as their primary source of drinking water. Although most bottled water is of good quality some bottled water contains bacterial contaminants. Reassurances from the water industries executives that bottled water is totally safe may be false.

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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answer; burned it;

answer(b) partnership';