Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Some viruses carry a few viral enzyme molecules within their capsids.
Some viruses carry a few viral enzyme molecules within their what?

Are humans a new or old species on the earth?
Are humans a new or old species on the earth?

Part of the scientific process, these are statistical probabilities rather than certainties?

Part of the scientific process, these are statistical probabilities rather than certainties?