Which of the following is thought to be the reason for the The Great Ordovician Biodiversification Event? Question 3 options: Meteors. Just because it's always the coolest option. Weathering of continental rocks provided ample nutrients for marine organisms. Widespread shallow seas in the tropical region provided the ideal habitat for abundant phytoplankton. Increased solar radiation during the Ordovician provided energy for abundant of phytoplankton.