from rotation of conception a body never stays same results twice, day in midnight to noon and day out noon to mid night?
Population never stays same ancestors any generation after their time since conceived so people are never alive longer than living conceived to dead so far since original great great grandparents were added to the food chain of this universal location existed for an estimated 5 billion revolutions around the same star, same solar system, same galaxy, same time and space everything changes currently here compounding what has into what does remain next rotation, next revolution, next generation.
So why does every known reality speculate life is too difficult to comprehend when navigating uniquely alive at the same time?