Which came first?

Don't tell Miss Turner but last week we borrowed her Butterfly Garden to help us understand how a caterpillar changes into a butterfly! 

We had a very interesting conversation in trying to decide which came first, the butterfly or the egg! Some of us decided that we wanted to be very intelligent scientists when we grew up so that we could earn lots of money by finding the answer to that question! So, what do you think? Which came first, the butterfly or the egg???