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How was life like in Nigeria after the country gained independence?

In 1990, the average income for an american worker was $1,518 per month. in 2000, the average income for an american worker was $2,632 per month. during this time period, a basket of necessities (food, housing, etc.) increased from $657 per month in 1990 to $1,402 per month in 2000. the real value of income ▼ increased decreased over that 10-year period.

Which statement about spreading knowledge of diseases and health around the world is correct?

The appalachian mountains rise to heights of about feet. 2,000 2,500 3,000 3,500