Yields on 3 month treasury bills have declined to 1.84% from 2.21% at the prior week's treasury auction. this indicates that: a. treasury bill prices are falling b. market interest rates are falling c. demand for treasury bills is weakening d. the federal reserve may have to loosen credit

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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