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

Ribosomes are the only organelles that prokaryotic cells have.
What are the only organelles that prokaryotic cells have?

The bones of the newborn skull are not fully ossified and are separated by large areas called fontanelles.
The bones of the newborn skull are not fully ossified and are separated by large areas called what?

When magma heats groundwater, it may come to the surface as a hot spring or a geyser.
When magma heats groundwater, it may come to the surface as a hot spring or a what?