instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
Protists are thought to be the oldest eukaryotes.
answer:
What is thought to be the oldest eukaryotes?


question:
A diet rich in calcium and vitamin d may reduce the risk of osteoporosis and related bone fractures.
answer:
A diet rich in calcium and what vitamin may reduce the risk of osteoporosis and related bone fractures?


question:
Nitrogen and oxygen forms as a result of decomposition when n2o  is heated.
answer:

What forms as a result of decomposition when n2o  is heated?