Detailed Instructions: Given a scientific passage and an answer, generate a question for the given answer.
Q: Passage: There are about 6,200 known species of living amphibians. They are classified into three orders: frogs and toads, salamanders and newts, and caecilians. Answer: amphibians
A:
Frogs and toads, salamanders and newts, and caecilians are the three orders of what group of animals?