A) vital index
B) growth rate
C) survival rate
D) biotic potential.
Correct Answer: A
Solution :
: A birth-death ratio is called as vital index. Natality is the birth rate and the death rate is called as mortality. For a population, the survival of individuals is more important than the death. The number of births in relation to the carrying capacity of the habitat is a fundamental factor influencing the mortality rate. When more youngs are born, the habitat supports but the surplus either die or leave the area. Because the number of survivors is more important than the number of dying individuals, mortality is better expressed as life expectancy.
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