In a study of 381 women with a particular disease, the subjects drank herbal mixtures to determine if the mixtures have an effect on the disease. does the given description correspond to an observational study or an experiment?

Observational study as there is no control group or variation

the united states has a federal government. the president is the head of the federal government of the united states. however, each state forms its government for administration purposes. the powers of the state governments are exercised within restricted state boundaries. and citizens participate in this government by voting.

well, there are a lot of places we get information about earth from. like science classes, websites, books, newspapers, etc.