Yes they do have them because it is true
Answer: Voluntary movements are movements that are under our concious control; involuntary movements are movements that are not.
Example of Voluntary: Playing piano
Example of Involuntary: Heart beating
It depends on what you’re learning, a possible answer is bias.
UV light caused cancer because it damages the DNA in our cells. Changing the characteristic of a cell can cause cancer
Tectonic boundaries is the correct answer