TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: Ribosomes are the only organelles that prokaryotic cells have.

SOLUTION: What are the only organelles that prokaryotic cells have?

PROBLEM: Invertebrates (and higher animals) can also be placed in one of two groups based on how they develop as embryos.

SOLUTION: Invertebrates (and higher animals) can also be placed in one of two groups based on how they develop as what?

PROBLEM: Tornadoes can occur in any.

SOLUTION:
At what time of the year can tornadoes occur?