how to destroy enemy

i create object that is a enemy and made it into prefab from prefab i make 10 enemies; give them a Health=3 and here is the script

using System.Collections; using System.Collections.Generic; using UnityEngine;

 public class EnemyHealth : MonoBehaviour
 {
     private int Health = 3;
 
     public GameObject EnemyDieEffect;
 
     void Update()
     {
         if (Health <= 0)
         {
             Instantiate(EnemyDieEffect, transform.position, Quaternion.identity);
             Destroy(gameObject);
         }
     }
 }

whenever i shoot the bullet it give damage to the enemy after 3 Damage player has to be destroyed yes it is destroyed but not that one which i shoot it destroys prefab's last enemy first and in the last it destroys prefab's first enemy Here is my script

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class BulletToRight : MonoBehaviour
 {   
     public float speed;
     public float BulletlifeTime;
     public int damage;
 
     public Rigidbody2D rb;
 
     private EnemyHealth enemyhealth;
     public Transform player;
     public GameObject playerBulleteffect;
     void Start()
     {
         rb = FindObjectOfType<Rigidbody2D>();
         enemyhealth = FindObjectOfType<EnemyHealth>();
         player = GameObject.FindGameObjectWithTag("Player").transform;
         Invoke("DestroyPlayerbullet", BulletlifeTime);
     } 
     void Update()
     {
         rb.velocity = Vector2.right * speed;
         //transform.Translate(transform.right * speed * Time.deltaTime);     
     }  
     void DestroyPlayerbullet()
     {        
         Destroy(gameObject);
     }
 
     void OnTriggerEnter2D(Collider2D col)
     {   
         // destroy player bulllet and spawn player bullet effect if player bullet collided with enemy tag object
        if (col.tag == "enemy")
         {           
             // player buller effect spawn
             Instantiate(playerBulleteffect, transform.position, Quaternion.identity);
 
             // destroy bullet projecttile
             Destroy(gameObject);
 
             // take Damage of enemy
             enemyhealth.Health = enemyhealth.Health - damage;
         }
     }
 
     
 }

if anyone Have any Suggestion Please reply :)