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The climate was warmer than it is now, and temperatures were up to 35 degrees Celsius in the oceans. During this period, it was so hot that the poles were completely free of ice. The atmosphere was much more rich in oxygen during this period than it is in present day. As for the geographic conditions, Pangaea was starting to break up and modern day continents started to form as well as modern day oceans.

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What were the main types of plants and animals?

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What were the main types of plants and animals?

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The main types of fauna consisted of many different types of dinosaurs, such as titanosaurs, Iguanodons, and Ankylosaurus. While, the main types of flora consisted mainly of angiosperms. During this period, some big evolutionary developments took place, such as the first flowering plants appearing and new dinosaurs appearing. Some types of fauna and flora that still exist in this period, that existed in previous periods include dinosaurs, turtles, snakes, and birds.

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1. http://www.aoml.noaa.gov/outreach/floridaseagrant/pdf_files/TropicalConnections_GeologicalTimeWithMajorEvolutionaryEventsInFossilRecord_KruczynskiFletcher.pdf
2. http://www.nhptv.org/wild/images/tawnydaylilyforestryDanTenaglia.jpg
3. https://3.bp.blogspot.com/-OnCIEbieUYU/WQX8s5Aa0CI/AAAAAAAAf_E/O29xGnVm-0kJeFZ611p4kSGpXdDn6QhXQCLcB/s1600/Biochemical-Angiosperms.jpg
4. https://www.nationalgeographic.com/science/prehistoric-world/cretaceous/
5. http://ns.umich.edu/new/releases/22942-variations-in-atmospheric-oxygen-levels-shaped-earth-s-climate-through-the-ages
6. https://sites.google.com/a/jeffcoschools.us/mreitsma/home/information-1
7. https://www.livescience.com/29231-cretaceous-period.html\
8. http://www.icr.org/i/wide/pterosaur_revolution_wide.jpg
9. https://biodifferences.com/wp-content/uploads/2017/06/angiosperm_2img.jpg
10. https://www.sciencedaily.com/releases/2015/05/150528083818.htm
11. https://upload.wikimedia.org/wikipedia/commons/c/cb/Impact_event.jpg
12. https://www.npl.washington.edu/av/altvw27.html
13. https://cdn.britannica.com/700x450/44/136144-004-76AAB173.jpg

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At the time of this period, Pangaea was being broken up into smaller continents and oceans started to form to fill the gap in between the newly formed continents. The shifting of continents, expanding of coasts, and widening of oceans had made the climate cooler and more moist. The atmosphere at this time had high atmospheric oxygen levels. The change in climate also set into motion extreme changes to the native plant and animal life. At the beginning of the period, dinosaurs were still abundant, however by the end of the period dinosaurs became extinct. In their place formed many mammals and flowering plants that spread across the landscape.

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When did the Cretaceous period take place?

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When did the Cretaceous period take place?

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The Cretaceous period started 146 million years ago and ended 66 million years ago. The Jurassic period came before the Cretaceous period and the Paleogene period came after.