Which characteristics are evidence of the olmec civilization’s advanced agricultural system? check all that apply. irrigation growing crops industrial machinery permanent settlements food surpluses chemical fertilizers

The evidence of the Olmec civilization’s advanced agricultural system are:  

Irrigation growing crops: Olmec civilization implemented irrigation systems in the coastal areas of the Gulf of Mexico in order to grow crops such as beans and corn.

Food surpluses: As they harvested the land twice a year, they generated food surpluses for the community. At the same time, food surpluses was possible due to the collection of plant food, sea food, among others.

Permanent settlements: Olmec civilization had permanents settlements with three main sities: San Lorenzo, La Venta and Laguna Los Cerros.  

irrigation  

growing crops

permanent settlements

food surpluses

the steam engine.

the locomotive.

the telephone.

the telegraph.

the internal combustion engine.

the rifle.

ironclad ships.

electricity/light bulb.