When the economy is operating at point c, the federal reserve may decrease the discount rate to
a. decrease inflation
b increase inflation
c decrease growth
d increase growth

D ; increase growth

Explanation:

The discount rate is one of the tools that the Federal Reserve uses to direct monetary policy.  Banks are subject to minimum reserves requirements. If a bank falls below this minimum, it can borrow from the banks with a surplus,  or borrow from the federal reserve. If it borrows from the Fed, the interest rate that applies is the discount rate. The discount rate is always higher than the fed fund rate; hence, banks use it as a last resort.

The discount rate and the fed rate have similar effects on the economy.  The Fed uses the discount rate to regulate the money supply in the country. When the growth in slow, the fed will reduce the discount rate.  A low discount rate means the cost of borrowing money goes down. The impact is that individuals and businesses will afford to borrow money for consumption and investment.

Increased levels of investments and consumption will mean a higher GDP, which is growth.

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.'