Which best describes an environmental concern in the twentieth century? depleted soils in once-fertile agricultural areas of africa and asia promotion of government-sponsored pronatalist measures increasing global cooling as a result of greenhouse gas emissions uncontrolled industrialization posing a dire threat to earth�s ecology

richard milhous nixon (january 9, 1913 – april 22, 1994) was the 37th president of the united states, serving from 1969 to 1974, when he became the only president to resign (quit). he is also known for corruption and the watergate scandal which resulted in the public losing trust in him and his resignation.

2. a land bridge connected asia and north america thousands of years ago.

4. crossing the land bridge would have been simple for the first migrants.

5. people might have crossed a land bridge while hunting animals.