of Anthropic Principle which shows our own universe appears to be fine-tuned for conscious life as we experience it. Universes have to be many in order to make our own universe not appear not fined-tuned for human being, i.e. our universe is just random accident in a statistical population of universes.
Anthropic Principle is a very interesting topic.
Link: https://en.wikipedia.org/wiki/Anthropic_principle