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

[EX Q]: Renewable energy sources emit fewer or no greenhouse gases.
[EX A]: What type energy sources emit fewer or no greenhouse gases?

[EX Q]: Eukaryotic cell division involves mitosis and cytokinesis.
[EX A]: Eukaryotic cell division involves mitosis and what?

[EX Q]: Pheromones are released into the environment for communication between animals of the same species.
[EX A]:
What kind of hormones are released into the environment for communication between animals of the same species?