Is a reflex part of the central nervous system, the peripheral
nervous system, or both? Explain.

Because the peripheral nervous system transmit reflex impulses from sense organs to central nervous system and then back to the sense organs. So both the Central nervous system and the peripheral systems are involved.

To understand a bit better.....

One of our body parts consists of a nervous system it is a complex network of neurons and cells that carry pieces of information to and from the brain and spinal cord to various parts of the body.

So in conclusion...

Yes! The Central nervous system and the peripheral systems are involved!So therefore your question is correct!

Hope this helps!

                                                                                                   -Tobie The Dog <3

(p.s a photo has been listed so you know what the nervous system is!)

answer; i believe the correct answer is (sporophyte);

your spelling is a little off : ]