1. Explain what might happen if one was to go back in time to the lower Precambrian and prevent photosynthesis from evolving? Please offer specifics
2. There is a lot of empty space on the timeline. Generally speaking, what is happening during these empty spaces? Please offer specifics.
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3. Using data from your timeline, comment on this statement: “A long time ago humans had to fight off marauding dinosaurs.”
4. If humanity finds an Earth-like planet around a Sun-like star, which is 109 years old, should we expect to find intelligent life? Why or why not? Be specific.