What is the main reason for the growth of any living organism?

To survive, any living thing on the planet needs to eat. Nutrition is necessary for strength, in order for metabolism to occur, reproductive function does not fade away. And the most important thing for which nutrition of any organism is needed is for its growth and development. Only at the expense of nutrition does any organism, or rather its cells feed, multiply, metabolic processes take place in them. This means that an organism in need of growth grows, and therefore lives on. And the more regular and complete it is in composition, the better and faster organisms grow.