Which portion of a reflex arc is located entirely within the central nervous system?

interneuron

Explanation:

¨The interneuron is most likely to be located entirely within the central nervous system.¨

Option (A) is the correct answer.

Explanation:

Beaches are the places which are part of shore of an ocean, sea, large river etc.

There are pebbles and sand at the shore of a beach. Waves of water in an ocean always change the ocean due to  erosion and addition of sand.

It is the force acted by the wave that pushes or pull the sand in different directions every time the wave comes.

So we can conclude that the statement beaches are always changes due to factors such as waves adding and eroding sand best describes beaches.