Since life first appeared on Earth, the size of the largest organisms increased in size by a factor of 10 quadrillion (1016 or 10,000,000,000,000,000). Two sudden bursts, each showing an organism volume increase by a factor of one million (106), account for most this growth.1 Both bursts occurred after a significant change in the quantity of oxygen in Earth’s atmosphere. The latter oxygenation event occurred just prior to the Cambrian explosion. Research into the timing and stability of the first oxygenation event provides more evidence supporting RTB’s creation model, which predicts that complex life would appear suddenly and early in Earth’s history.