why all my prefabs get destroyed whem i destroy one of them,Why all my prefabs get destroyed whem i destroy one of them

I am making a game, and the body has a separate object for the head, i wanted to make the head a weaker point, but whem i clonned my prefab and shooted one of them all the other clones got destroyed;

body: public int VidaTotal; public static int Vida;

 void Start () {
     Vida = VidaTotal;
 }
 
 // Update is called once per frame
 void Update () {
     if(Vida <= 0){
         Destroy(this);

     }
 }

void OnTriggerEnter2D(Collider2D col){ if(col.gameObject.CompareTag("bullet")){ Vida --; Destroy(col.gameObject);

    }

}

Head : void OnTriggerEnter2D(Collider2D col){ if(col.gameObject.CompareTag("bullet")){ Enemy.Vida = - 1; Destroy(col.gameObject);

    },