The maya based their calendar on careful observations of
the change in the seasons.
the migration of birds.
yearly precipitation patterns.
the planets, sun, and moon.

Whether or not a given study has the possibility of causing harm to participants:

Eter lives in a beautiful region. peter and other residents of his region use water from the river that flows through their region. recently, mark industries decided to set up their chemical plant near that river. peter realized that the waste from the chemical plant would pollute the river. he decided to seek a legal ordinance that would restrict the use of land near that river for specific use only. which type of zoning will peter and his region?

Sociology of medicine refers to the study of how social factors affect