Final answer:
A country with a high fertility rate of 4.0 despite a negative migration rate is likely to have a rapidly expanding age structure, typically seen in Stage 2 or early Stage 3 of the DTM, characterized by high birth rates and declining death rates.
Step-by-step explanation:
A developing country with a total fertility rate of 4.0 and a net migration rate of -3.5 is likely to have an age structure that is expanding rapidly. The high fertility rate indicates that many children are being born, which usually results in a broad base in the age structure diagram, indicative of a growing population. Even with a negative migration rate, the high fertility rate can sustain population growth. According to the Demographic Transition Model (DTM), this country would probably be in Stage 2 or early Stage 3, where birth rates remain high but death rates have begun to fall, leading to population growth.
In the DTM, Stage 4 is characterized by low birth and death rates leading to a stabilized population with modest growth, or sometimes reaching Stage 5, where the growth rate becomes negative due to very low fertility rates and an aging population. Countries in Stage 4 or 5 often have more uniform age structure diagrams without a wide base, indicating slower or negative population growth.