Porque en los tropicos el clima es mas calido?

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

What is the border between layers a through f and layer g called?

What is one early technological advance that shaped culture? a the use of fire b the discovery of arable land c family units. d migration