Which of the following is not a theory for the decline of the mayan civilization?
a.
a natural disaster
c.
a lack of invention and adaptation
b.
the invasion by another group
d.
an internal revolt

How has urban renewal affected poorer neighborhoods in major cities? check all that apply. 1. communities have been transformed to meet the needs of the modern population. 2. old stores and factories have been renovated and used for new purposes. 3. crime rates have increased as more money has come into the neighborhoods. 4. many community businesses have gone into decline or been forced to close. 5. a number of african americans have been displaced from their homes.