"If the Federal Reserve Open Market Committee authorizes its trading desk to enter into system wide repurchase agreements, the effect will be to:"

increase yields and lower debt prices

Explanation:

In a given situation like this, it implies that the Federal Reserve trading desk is temporarily selling government securities to the dealers, for the purpose of sapping them of cash. This reduces free reserves which can be given out as loans by the banks. In return, it results in a raise market interest, given that the funds are not readily available. Hence, when the interest rates rise, debt prices will fall. This type of action is taken if the government believes the economy is growing too faster than desired.

Therefore, the correct answer is "increase yields and lower debt prices"

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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.'