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Essay / Research Paper Abstract
A 3 page essay that reports on interesting facts revealed by a documentary on The History Channel titled "Evolve: The Eye." The writer describes five aspects of the program. No additional sources are cited.
Page Count:
3 pages (~225 words per page)
File: KL9_khevolveye.doc
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Unformatted sample text from the term paper:
five evolutionary issues that are intriguing, which grabbed the attention of this writer/tutor. 1. One of evolutions most significant achievements: Until animals evolved the ability to see, life on planet
earth remained simple and small. Sight, which provides predators the ability to target prey, was the necessary evolutionary step that enabled life to diversify and expand in variety and size.
2. Earliest eyes were primitive: Scientists believe that the earliest eyes were similar to those of the bell jelly fish, a tiny little thing that has light sensing cells,
referred to as "eye spots" around its base ("Evolve"). When the bell jelly senses green light it relaxes, extends its tentacles and floats down to the bottom to feed. However,
when it senses light that is more intense, it draws up and tries to escape as this tells the organism that the light is to intense for a transparent creature
to endure ("Evolve"). 3. Two basic categories of eyes: There are two basic categories for eyes: compounds eyes, which are comprised of thousands of lens; and eyes that resemble
single-lens cameras, which are referred to as the "vertebrate eye" ("Evolve"). Compound eyes evolved during the Cambrian period, roughly 544 million years ago. It was during this period that life
began to diversify and the number of species that appeared at this time can be described as an "explosion" ("Evolve"). The Cambrian was an "evolutionary arms race," as jaws, claws,
and body armor proliferated, with the most significant weapon in the evolutionary arsenal being the development of the compound eye ("Evolve"). Compound eyes are comprised of small lens, often numbering
in the thousands. Fruit flies have 7,000 lens in their eyes and Dragonflies have 29,000, which allows them to focus accurately even when flying at 38 miles per hour
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