Array

Question 1

public GameObject[] animalPrefabs = new Game object[5];

Answer 1

int animalIndex = Random.Range(0, animalPrefabs.Length);

Instantiate (animalPrefabs[animalIndex], new Vector3(0,0,20), animalPrefabs[animalIndex].transform.rotation);

Question 2

public List < GameObject > targets;

Answer 2

Same as Array but slight diferent