player life lose when timer is run out

Questions & Answers
1

I have life 0f 3hearts and a timer of 60 secs and when the timer is run out my lives will loose to 1 heart
how?
this is my timer class

public class Timer : MonoBehaviour {
	public float countdownTimer;
	private Text timeText;
	private Life lifeSystem;
	private 
	void Start () {
		timeText = GetComponent<Text> ();
		lifeSystem = FindObjectOfType<Life> ();
	}

	void Update () {
		countdownTimer -= Time.deltaTime;
		timeText.text = "" + Mathf.Round (countdownTimer);
		if (countdownTimer <= 0) {
			countdownTimer = 0;

		}

	}
2

I would do something like this:

public class Life : MonoBehaviour {
     public int playerLife;
     private int lifecounter;
     public GameObject wrongPOPUP;
     public GameObject gameOverScreen;
     public GameObject expireScreen;
     public Text life;

     public float countdownTimer;
     private Text timeText;
    
     void Start() {
         // What was Timer object called before?? replace name.
         life = GetComponent<Text> ();
         timeText = GameObject.Find("Timer").GetComponent<Text>();
         lifecounter = playerLife;
     }

     void Update() {
        countdownTimer -= Time.deltaTime;
        timeText.text = "" + Mathf.Round (countdownTimer);
        if (countdownTimer <= 0) {
           countdownTimer = 0;
           lifecounter--;
        }

        if (lifecounter <= 0) {
           lifecounter = 0;
           gameOverScreen.SetActive (true);
        }
        life.text = "" + lifecounter;
     }
    
     public void wrongAnswer(){
         lifecounter--;
         StartCoroutine (wrongLoading ());
         wrongPOPUP.SetActive (true);
     }
     IEnumerator wrongLoading(){
         yield return new WaitForSeconds (0.3f);
         wrongPOPUP.SetActive (false);
     }
}