Countries with a high tfr sometimes have very young populations. why are young populations so challenging and expensive for a country to care for?
a. they require more healthcare, immunization, and check-ups for children.
b. they require more pensions for retiring workers.
c. they require more care for the elderly.
d. they require more workers because so many are retiring.

The correct answer is option A, that is, they require more healthcare, immunization, and check-ups for children.

Explanation:

TFR or total fertility rate signifies towards the average of children possessed by women in a nation during their entire lifetime and is associated with other elements like fertility rates and growth of population. The high TFR signifies that there are more young people and children. Thus, with the population comprising more children, there would be a requirement for more healthcare like more immunization and check-ups, and also more spending on education is required.

propane is burned to provide the heat in many cooking grills. the chemical reaction for this process is shown in the equation below.

c3h8 + 5o2 ? 3 co2 + 4h2o + energy

what are the products in this chemical reaction?

3co2 + 4h2o + energy