At the first question is A. 60 year old
Answer:
More of the world's population is now concentrated in heavily populated urban areas known as cities. 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 sinergies, the responsible use and management of natural resources.
Explanation:
Answer:
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A. A single variation can be beneficial under some conditions and harmful under other conditions
Long-term exposure to current ambient PM concentrations may lead to a marked reduction in life expectancy. The reduction in life expectancy is primarily due to increasedcardio-pulmonary and lung cancer mortality.
Increases are likely in lower respiratory symptoms and reduced lung function in children, and chronic obstructive pulmonary disease and reduced lung function in adults. Hope this helped=)
