All of them.
Plants are more important for medicine than clothes. There is subsitude for plant fiber available for clothes but there is no subsitude for plant products used in medicine. The synthetic chemicals used as medicine have side effects. the plant products are by and large are quite safe.
Hard to say. Plants were used in medicine from prehistoric time.
whole plant is used for medicine
yes, as a matter of fact, it is.
HYSSOP
Aloe plants are turned to medicine by extracting the aloe from the plant. A piece of an aloe vera plant can be used for medicine by tearing a small part of the plant off and rubbing the slimy aloe on the afflicted skin.
Chamomile
Extracts from the plant's root are used in alternative medicine as a soap and as an herbal dietary supplement.
Muira puama is a plant. The plant's wood and root can be used to make medicine. It can be used to treat sexual disorders, an upset stomach, menstrual disorders, sore joints, loss of appetite and other conditions.
A sabadilla is a Mexican and Central American plant of the lily family, or the seeds of this plant, commonly used in medicine and insecticides.
The root of the plant is used medicinally, particularly in China, where traditional Chinese medicine places a high value on it.
10,000-20,000. source BBC