Which contribution did the Olmecs make to the present day Mexican landscape

The colossal heads that they carved.

Explanation:

The Olmecs carved big heads in the south region of the  Gulf of Mexico. These heads are not identical. Each one has its unique features. Experts in the Olmecs society think that they might represent significant people for the Olmec civilization since they are all different and placed in  Olmec centers, which were places of high activity and importance for this society.

the answer is

a) revise existing treaties

b) do away with political alliances

c) prevent the spread of communism

d) bring an end to european colonization

the main goal of the southeast asia treaty organization was to prevent the spread of communism in southeast asia.

answer; i believe its (transgender);