"When The Bank of Bank County borrows funds from the Federal Reserve; the rate the Fed charges the commercial bank is called the rate."

Bank Rate/ Discount Rate

Explanation:

The Bank Rate is the interest rate that the Fed as the country's Central Bank charges commercial banks when they borrow money from it. The loans given are usually short term in nature.

The Bank Rate is a very useful tool in Monetary Policy by the Central Bank. If the Fed for instance would like to increase Economic activity by injecting cash into the economy, they can lower the bank rate and thus encourage more banks to loan money from them which will then be loaned to the public. If the Fed wanted to decrease Economic activity, the reverse would hold true.

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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.'