What is one of the primary jobs of the u. s. army corps of engineers?
a.)dam building
b.) designing smart growth cities
c.) building greenways through suburban and urban communities
d.) engineering plans for smart urban growth

answer; /// the correct answer is evidence of the olmec civilization has been found in southern american in a hot steamy forest, archaeologists have found earthen artifacts at several sites that were evidence of the olmec civilization. these   artifacts were mounds,courtyards and pyramids build of stones, also on top of the mounds were many monuments made of stone, some of these stone structures are very large, they weigh as much as 44

food chain i would say only because there is competition on getting food and survival