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

Limestone is insoluble in water, so acid can dissolve it.
Limestone is insoluble in water, so what can dissolve it?

Transpiration is when plant roots absorb liquid water and release water vapor into the atmosphere.
What is it called when plant roots absorb liquid water and release water vapor into the atmosphere?

In aquatic communities, the main producers are photosynthetic protists and prokaryotes.

In aquatic communities, the main producers are photosynthetic protists and what?