Which two agricultural contributions are common to both Northeast Woodland Indians and Southeast Indians

The two agricultural contributions that are common to both Northeast Woodland Indians and Southeast Indians are the following: They used a creative method to maintain the fertility of the land and they cultivated the “three sisters” crops of corn, beans, and squash.

Explanation:

sumerians were responsible.

option d is correct. corroborated sources of historical evidence   is necessary to validate a claim about an event in history.

historians tend to use written sources, but audio and visual materials as well as artifacts are important objects that supply information to modern historians.

historical sources are usually divided into two categories: primary and secondary sources. depending on the historian's intent, some sources shift their designation. determining what type of sources toimplement, and the level of credibility and reliability of those sources, is a significant step in critical thinking for the historian.

explanation: