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The study of how populations of plants, animals, and other species vary across time and place and interact with their environment is known as population ecology. Populations are groupings of creatures belonging to the same species that live in the same location at the same time.

In population dynamics, the age structure of a population is critical. The proportion of a population in various age groups is referred to as age structure. The capacity to correlate population growth with the level of economic development in the region is made possible by the age structure.

The highest population growth would be observed in less economically developed countries in Africa and Asia.

Developed countries, such as Italy, have zero population growth.

Thus, option (c) is the correct answer.