An increase in the life expectancy of Australians is most likely to result from (A) lower morbidity rates - HSC - SSCE Personal Development and Physical Education - Question 6 - 2010 - Paper 1

To understand why an increase in life expectancy is most likely associated with lower infant mortality rates, we first recognize that life expectancy is significantly influenced by the health and survival of infants. Lower infant mortality rates indicate better healthcare, nutrition, and overall living conditions for mothers and infants. When infants survive at higher rates, it leads to a higher overall life expectancy in the population.

In contrast, higher morbidity or higher infant mortality rates would likely contribute to shorter life expectancy, as these factors reflect poor health outcomes and increased risk of death. Therefore, the most logical choice here is C: lower infant mortality rates.