An astronomical unit (a. u.) is
the diameter of the sun
the distance from the sun to the edge of the solar system
the distance from the sun to the earth
the mass of the earth

In a world that produces enough food for every human, why is the distribution of food consumption and production so unequal? in a few sentences, explain why production and consumption of food is lower in the least-development countries (ldcs).

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

After railroads, the next revolution of transportation came with the development of (a) automobile (b) telegraph (c) steam engine