Many factors affect soil fertility. One biotic factor would be the
A) mineral content of the soil.
B) moisture content of the soil.
C) number of earthworms in the soil.
D) presence or absence of toxic chemicals.

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