Answer:
- Highest in the highest-income countries.
Step-by-step explanation:
Life expectancy is demonstrated as the statistical measure to estimate the average age or time that an individual is expected to live.
As per the question, life expectancy in global terms is 'highest in the highest-income countries' primarily due to improved expenditure on medical facilities, public health, as well as nutrition in such countries that has rapidly reduced the mortality and infant mortality rate. It assists in enhancing the life expectancy rate in the country while the countries with less income are unable to focus on these crucial aspects of public health and nutrition appropriately. Thus, the 'life expectancy is higher in higher income countries.'