Does rebirth conflict with evolution?

I'm trying to understand how modern Buddhism deals with our current scientific understanding. Science indicates that life began on this planet with a small set of life forms. So there was a point in time where only a few life forms would be capable of rebirth. Now, however, there are over 7 billion humans and immensely more other creatures which can all be reborn. Where did all the souls/consciousnesses that exist now come from? How does the idea of rebirth fit with the evolution of life on Earth? I am very curious as to how modern Buddhism deals with this question. Please forgive me if it is a dumb question, my understanding of Buddhism is very minimal. Thanks in advance!