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... An illustration of the diversity of marine organisms in the Ordovician sea (Avildsen et al 1998). ... Two interesting organisms of the Ordovician sea were the trilobites and the nautiloids. ... Trilobites were abundant in the Ordovician sea, reaching the maximum peak of their development during the Early Ordovician, and started to decline in numbers during the Middle Ordovician (Kazlev, 1998). ... Finally, the onset of glaciation at the closing stages of the Ordovician period resulted in a dramatic decrease in sea level, and consequently a reduction in the amount of ecospace.
Approximate Word count = 1172 Approximate Pages = 4.7 (250 words per page double spaced)
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