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Essay / Research Paper Abstract
A 3 page script that is, hypothetically, suppose to accompany an animated film that pictures the origins of life on Earth. The writer covers such as topics as continental drift, changes in oxygen levels in the atmosphere and the slow emergence of life in specific eons and periods. Bibliography lists 3 sources.
Page Count:
3 pages (~225 words per page)
File: D0_khevoscr.rtf
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Unformatted sample text from the term paper:
refer to as Pangaea (Continental drift). Slowly, this huge continent broke up and the various pieces drifted apart creating the landmasses that we now today. However, the formation of Pangaea
occurred only after other early continent formations developed, shifted and then broke apart. This process was accompanied by the emergence of life on Earth. The earliest forms of life occurred
in the seas. These were prokaryotes, single-celled organisms with no nucleus and they appeared during the Archean Eon, between 3.9 and 2.5 billion years ago (Geologic Time Line). During the
Proterozoic Eon, 2.5 billion to 540 million years ago, plants developed the ability to obtain energy through photosynthesis, which altered the primal atmosphere, increasing its oxygen level (Geologic Time Line).
The release of tremendous amounts of oxygen into the atmosphere was a crisis for the life that exited at this time because oxygen was toxic to these primitive life forms
(Walsh). However, life adapted. Eukaryotes, single-celled organisms with a nucleus, such as advanced forms of algae and a variety of protozoa (Geologic Time Line). These life forms reproduced sexually,
creating greater genetic diversity and this facilitated the development of multi-celled, soft-bodied marine organisms (metazoans) (Geologic Time Line). Invertebrates appeared during the Paleozoic Era, which is divided into six periods.
Due to multiple collisions of the Earths crust, another super-continent appeared during the Cambrian Period (540-490 million years ago), which is referred to as Gondwana. During the second of the
Paleozoic periods, the Ordovician (490-443 million years ago, marine invertebrates are the dominant form of life on Earth. The continents of North America, Europe and Africa merged. This merged landmass
was located near the equator, with Gondwana situated in the south polar region. Late in the Silurian period (443-417 million years ago), fish evolve jaws, the first sharks appear and
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