If a bank deposit will double in value in 18 years, the rule of 72 implies that the interest rate on the deposit must equal is approximately:

a. 3 percent.
b. 4 percent
c. 6 percent
d. 8 percent

b. 4 percent

Explanation:

According to the rule of 72, hte number of years required for an investment to be doubled can be obtained by dividing 72 by the interest rate (in percentage). If it takes 18 years for the investment to bouble in value, the interest rate is:

The interest rate on the deposit is 4%.

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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.'