1. The bookmarks indicated the following six events:
· Formation of the earth and moon 4.6 billion years ago
· Earliest life, 3.9 billion years ago
· Early land plants 420 million years ago
· Largest mass extinction 248 million years ago
· Dinosaur extinction 65 million years ago
· "Lucy", early hominid, 4 million years ago
2. In the Archaean period, there are cyanobacteria and stromatites.
3. The three periods of time that are described as eras are the Paleozoic, the Mesozoic, and the Cenozoic.
4. There are five mass extinction events listed. They are:
End-Orcovician, where many types of ocean life became extinct including trilobites, brachiopods, and graptolites. The Late Devonian, stromatoporoids, brachiopods associated with reefs and more trilobites all became extinct, as coral systems suffered heavy losses. The End-Permian extinction saw some corals, trilobites, and types of brachiopods, orinoids and shelled cephalopods all became extinct at this time. The End-Triassic extinction hit many of those same groups, along with corals, and the land-dwelling phytosaurs. The End-Cretaceous killed off the non-avian dinosaurs, pterosaurs, mosasaurs, some groups of cephalopods and bivalves.
5. The End-Cretaceous appears to have been caused by an asteroid that hit the earth that created...
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