Use your vocabulary words to complete the sentences below.

More of the world's population is now concentrated in heavily populated urban areas known as . This is quite a contrast from the past, when or native groups were either farmers or — hunters and gatherers who moved between places in search of food. Advanced technology has led to , the integration of world economics and cultures, in the world's more developed countries. This integration requires increased , the responsible use and management of natural resources.

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Explanation:

More of the world's population is now concentrated in heavily populated urban areas known as megalopolis. This is quite a contrast from the past, when indigenous or native groups were either farmers or nomads— hunters and gatherers who moved between places in search of food. Advanced technology has led to globalization, the integration of world economics and cultures, in the world's more developed countries. This integration requires increased conservation, the responsible use and management of natural resources.

fertilization is the union of an egg and a sperm cell i believe.