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

[EX Q]: The nuclear envelope is a double-layered plasma membrane like the cell membrane, although without membrane proteins.
[EX A]: The nuclear envelope is a double-layered plasma membrane like the cell membrane, although without what?

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

[EX Q]: A supply of stored food do seeds have that spores do not.
[EX A]:
What do seeds have that spores do not?