Birth and Death Rates of Populations Are Not Constant with Time.If

Multiple Choice

Birth and death rates of populations are not constant with time.If the birth rate exceeds the death rate,then the population increases with time.If the death rate exceeds the birth rate,the population decreases with time.Death rates can change unexpectedly due to all of the following conditions except

A) disease.
B) advances in medicine.
C) fertility rates.
D) war.