Aiden watched the video "Secrets of the Origin of Life" which showed how some of the oldest fossils are of cyanobacteria and indicated what the early environmental conditions for life on Earth were. He read the text "A Closer Look: Drilling Into the Past" which discussed how oxygen isotopes in fossil foraminifera taken from seafloor cores indicate ancient global climates. He watched a video discussing this scientific technique. He completed the lesson review.