Why do organisms grow and multiply?

Primarily, each organism must leave behind offspring, this is laid down at the genetic level. Whether it is an animal or a plant, it gives a small particle of itself to continue its kind. This particle cannot be initially as large as the mother’s organism, but it has the necessary minimum. That is why different creatures are born small and in the course of their life they grow into an already large and adult organism. An organism that is ready to reproduce is ready to repeat the eternal cycle of life.