The question of human existence has intrigued philosophers and scientists alike, with various theories attempting to explain our presence on Earth. One significant answer posits that the survival of a specific organism, Pikaia Gracilens, played a crucial role in the evolutionary chain leading to humans. This organism, which lived during a critical period in Earth's history, represents a vital link in the survival and development of complex life forms.

In Christopher Hitchens' book, "God Is Not Great: How Religion Poisons Everything," the author addresses existential inquiries, including why we are here. He emphasizes that our existence is not just random chance but is rooted in the survival of our ancestors, including early species like Pikaia. This perspective invites readers to reflect on the relationship between evolution, existence, and perhaps the larger implications of belief systems on understanding our place in the universe.