If the age of the most layer of a rock sample is more than 2 million years, which of the following could be the age of the upper layers. A) Less than 1 million B) Greater than 3.5 million C) Between 2 million and 3 million
D) Between 3 million and 3.5 million

Which barrier to economic development is shown in the following examples? i. the high rate of hiv infection in underdeveloped nations ii. the use of children as soldiers in uganda’s army in the early 2000s iii. low literacy rates in underdeveloped nations with limited exposure to adequate education a. foreign debt b. political instability c. widespread disease d. low levels of social welfare