Question: What percentage of US drugs are derived from plants, animals, and micro-organisms?
Sentence: A significant proportion of drugs are derived, directly or indirectly, from biological sources: at least 50% of the pharmaceutical compounds on the US market are derived from plants, animals, and micro-organisms, while about 80% of the world population depends on medicines from nature (used in either modern or traditional medical practice) for primary healthcare.
Answer in sentence: yes