Two gases X and y used the plant and animals during the daytime
The dried and grated root of which plant is baked to make cassava bread, and is used to make a beverage called piwarry from its fermented juices?
The root of which plant, native to South America, is (in various forms) emetic, diaphoretic and expectorant, a stimulant to the stomach, intestines and liver, and a restorative?
