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

[Q]: Optics explains the behavior of visible light and electromagnetic waves.
[A]: What type of physics explains the behavior of visible light and electromagnetic waves?


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


[Q]: In invertebrates group of animals several forms of asexual reproduction are found.
[A]:
In what group of animals several forms of asexual reproduction are found?