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

Like mitochondria, plastids contain their own dna.
Like mitochondria, plastids contain their own what?

Carbon dioxide is an example of a material that easily undergoes sublimation.
Carbon dioxide is an example of a material that easily undergoes what?

The name of artificial barriers that people build to protect shorelines is breakwaters.

What is the name of artificial barriers that people build to protect shorelines?