Jayden's mother took him to a mother-infant swim class. when she dropped jayden in the shallow end of the pool, she was surprised to see that he instinctively held his breath and moved his arms and legs in swimming movements. this is an example of

Reflex

Explanation:

A reflex or reflex action works in response to a stimulus in an involuntary and almost immediate movement.

Neural connections called reflex arcs make a reflex possible, that can act on an impulse before it reaches the brain.

The reflex is then an automatic response to a stimulus not receiving or needing active thinking.

This is an example of a REFLEX

Explanation:

A reflex action is an involuntary or instantaneous response to a given stimulus at that particular moment which protect our body from a situation that can injure us. For instance when we mistakenly touch a hot pot or iron and our nerves tells us to retreat immediately. It is our survival instinct.

This we do subconsciously since our nerves signal an immediate response to protect our bodies as soon as possible.

Jayden's body immediately realises that he can drown if he doesn't swim hence the reflex is to swim quick.