Obviously spontaneous generation was a scientific theory that just didn't pan out. Watch the video HERE to see our current theory on the Origin of Life. Complete the fill in the blank note page in your notebook as you watch.
To put the timeline of events in perspective for you, check out the visual below. It is a clock (like the one in the classroom!) where the major earth events are charted in hours, minutes, and seconds. So if ALL of Earth's history was 24 hours on a clock, the appearance of humans would have occurred within the last minute!