▶ SUBSCRIBE HAPPY LEARNING! http://bit.ly/HappyLearningTV Educational Videos and songs for Kids. Today we’re going to learn the vital functions of living things, nutrition, interaction and reproduction. Nutrition As you know, all living things need food, and that is the function called Nutrition. Depending on what food they eat, animals may herbivores, carnivores or omnivores. Herbivores eat plants and grasses, and they may eat the stems, roots, fruit, seeds or leaves... just like this ta