Given a scientific passage and an answer, generate a question for the given answer.

Ex Input:
Passage: Describe hurricane formation and the damage they cause. Answer: bacteria

Ex Output:
Yogurt is made with milk fermented with what?

Ex Input:
Passage: According to the table, aluminum has an atomic number of 13. Therefore, every aluminum atom has 13 protons in its nucleus. Iron has an atomic number of 26. Therefore, every iron atom has 26 protons in its nucleus. Carbon has an atomic number of 6. Therefore, every carbon atom has 6 protons in its nucleus. Saylor URL: http://www. saylor. org/books. Answer: nucleus

Ex Output:
According to the table, aluminum has an atomic number of 13. therefore, every aluminum atom has 13 protons in its what?

Ex Input:
Passage: There are two basic types of cells, prokaryotic cells and eukaryotic cells . The main difference between eukaryotic and prokaryotic cells is that eukaryotic cells have a nucleus . The nucleus is where cells store their DNA , which is the genetic material. The nucleus is surrounded by a membrane. Prokaryotic cells do not have a nucleus. Instead, their DNA floats around inside the cell. Organisms with prokaryotic cells are called prokaryotes . All prokaryotes are single-celled (unicellular) organisms. Bacteria and Archaea are the only prokaryotes. Organisms with eukaryotic cells are called eukaryotes . Animals, plants, fungi, and protists are eukaryotes. All multicellular organisms are eukaryotes. Eukaryotes may also be single-celled. Answer: eukaryotic cells have a nucleus

Ex Output:
What is the main difference between eukaryotic and prokaryotic cells?