Scientists have learned about the Ancestral Pueblo mostly by studying

mounds.

The statement is incorrect. Scientists have actually learned about the Ancestral Pueblo by studying various aspects of their culture and archaeological sites, including mounds, but not predominantly through studying mounds alone. The Ancestral Pueblo were an ancient Native American culture that inhabited the southwestern United States, primarily in what is now Arizona, New Mexico, Utah, and Colorado. Archaeologists and researchers have studied various sources of evidence to learn about this civilization, including pottery, architecture, rock art, artifacts, agricultural practices, and oral traditions passed down by modern Pueblo peoples. Mounds are one archaeological feature that has provided valuable insights into Ancestral Pueblo communities, as they often contain evidence of structures, burials, and artifacts. However, studies of mounds alone would not provide a comprehensive understanding of the Ancestral Pueblo culture.