When I was going to school, I asked the biology teacher a question, but he couldn't give an answer, and he said it was a good question, but I don't know the answer, go ask someone else because it is related to metaphysics. This question has always remained in my mind, how do cells know that it should multiply in their DNA and stop a moment later? Is their command inherent? Is this their behavior spontaneous? How do they understand and know what to do? Who gives them orders? What is the story? I hope I asked clearly. I know that genes or DNA and RNA do their work and this is based on chemical reactions, but why and where do they know? What is the reason for their behavior? Is this instinct? Is it possible for an intelligent being like a human being to act instinctively? Don't those genetic parts have intelligence?