diff --git a/submissions/DaniaB24/oop-exercise/index.js b/submissions/DaniaB24/oop-exercise/index.js
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+/* Refer to https://github.com/OleksiyRudenko/a-tiny-JS-world for the task details
+   Complete the below for code reviewers' convenience:
+
+   Code repository: _put repo URL here_
+   Web app: _put project's github pages URL here_
+   */
+
+// ======== OBJECTS DEFINITIONS ========
+// Define your objects here
+class Inhabitant {
+  constructor(species, name, gender, saying, legs) {
+    this.species = species;
+    this.name = name;
+    this.saying = saying;
+    this.gender = gender;
+    this.legs = legs;
+  }
+  say() {
+    return `
+      Hi! I'm ${this.species}. My name is ${this.name}. My gender is ${this.gender}. I've ${this.legs} legs. I want to say ${this.saying}.`;
+  }
+}
+
+class Human extends Inhabitant {
+  constructor(name, gender, saying, hands = 2) {
+    super("human", name, gender, saying, 2);
+    this.hands = hands;
+  }
+  say() {
+    return super.say() + ("I have " + this.hands + " hands.");
+  }
+}
+class Animal extends Inhabitant {
+  constructor(species, name, gender, saying) {
+    super(species, name, gender, saying, 4);
+  }
+}
+class Cat extends Animal {
+  constructor(name, gender, saying) {
+    super("cat", name, gender, saying);
+  }
+}
+class Dog extends Animal {
+  constructor(name, gender, saying) {
+    super("dog", name, gender, saying);
+  }
+}
+class Man extends Human {
+  constructor(name, saying) {
+    super(name, "male", saying);
+  }
+}
+class Woman extends Human {
+  constructor(name, saying) {
+    super(name, "female", saying);
+  }
+}
+
+const cat = new Cat("Mars", "male", "mmeeow");
+const dog = new Dog("Sara", "female", "woofff");
+const man = new Man("Ron", "ahoj");
+const woman = new Woman("Hermione", "hiiii");
+
+const creatures = [cat, dog, man, woman];
+
+// ======== OUTPUT ========
+creatures.forEach((creature) => print(creature.say()));
+
+/* Use print(message) for output.
+   Default tag for message is <pre>. Use print(message,'div') to change containing element tag.
+
+   Message can contain HTML markup. You may also tweak index.html and/or styles.css.
+   However, please, REFRAIN from improving visuals at least until your code is reviewed
+   so code reviewers might focus on a single file that is index.js.
+   */
+
+/* Print examples:
+   print('ABC');
+   print('<strong>ABC</strong>');
+   print('<strong>ABC</strong>', 'div');
+
+   print('human; John; male; 2; 2; Hello world!; Rex, Tom, Jenny');
+   print('human; <strong>John</strong>; male; 2; 2; <em>Hello world!</em>; Rex, Tom, Jenny');
+   print('human; <strong>John</strong>; male; 2; 2; <em>Hello world!</em>; Rex, Tom, Jenny', 'div');
+   */