What is happening to the birth rate and age structure of that population when population growth increases in an area?
a. increasing birth rate with a greater number of young organisms
b. increasing birth rate with a smaller number of old organisms
c. increasing birth rate with a smaller number of young organisms
d. increasing birth rate with a greater number of old organisms

The correct option is A.

When an area experience increase in the population growth of the organisms that are living in it is usually as a result of combination of many favorable factors. These factors usually result in increasing birth rate, that is, the number of offspring that are been reproduce will increase significantly. This in turn will lead to increase in the number of young living organisms in the population and ultimately in the number of young individuals that are capable of reproducing successfully.