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

Learning to get used to something after being exposed to it for a while is associated with habituation learning.
Learning to get used to something after being exposed to it for a while is associated with what kind of learning?

Sexually do invertebrates reproduce.
How do invertebrates reproduce?

Saturated hydrocarbons are the simplest hydrocarbons.

What are the simplest hydrocarbons?