Which is a characteristic of the Olmec civilization? a. They had organized ceremonial centers.

b. They used a cougar motif in their artwork.

c. They used an intricate form of hieroglyphic writing.

d. They had an elaborate way of designing their urban spaces.

crop rotation kepy different plants in the soil instead of once constintly. when switching out plants you have different nutrients being absorbed at different speeds and different roots growing differently therfore the spoil and water flow have to adapt and carry fresh nutrients to carry the constant changes that were going on in the soil.

b) the confederacy had to pay all union war expenses.