The two correct answers regarding how the Khmer civilization shaped culture in Southeast Asia are:
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Used irrigation canals and reservoirs to support large scale rice farming - The Khmer civilization is known for its advanced irrigation systems, which significantly enhanced agricultural productivity and supported the growth of their empire.
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Built vast Buddhist temple complexes - The Khmer are famous for their monumental temple complexes, such as Angkor Wat, which reflect the cultural and religious influence of Buddhism in the region. These structures have had a lasting impact on architecture and culture in Southeast Asia.
The other options, while interesting in their own contexts, do not accurately describe the contributions of the Khmer civilization.