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Essay / Research Paper Abstract
This 3 page paper discusses the frog and perch and their importance in the animal kingdom. Bibliography lists 4 sources.
Page Count:
3 pages (~225 words per page)
File: KV32_HV683111.rtf
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Unformatted sample text from the term paper:
because it and other amphibians have evolved from one group, the perch is more aggressive because it is an invasive species. Discussion One of the debates in science, apparently, has
been how amphibians evolved since there didnt seem to be any one "ancestor" of the various forms of amphibian life forms. Now a fossil found in Texas, known as
"Gerobatrachus hottoni (Hottons elder frog)," which is approximately 300 million years old, "proves the previously disputed fact that some modern amphibians, frogs and salamanders evolved from one group of ancient
primitive amphibians called temnospondyls, some of which were up to 1.5 metres long" (Skrepnick, 2008). The dispute arose because there were no fossils that showed a "transitional form" between ancient
amphibians and todays frogs and salamanders but this fossil provides that link (Skrepnick, 2008). The Gerobatrachus fossil "has the chassis of an archaic temnospondyl, along with many characteristic features
seen in modern frogs, toads and salamanders"; that is, it combines features of ancient animals with those found in modern amphibians. The appearance of the fossil suggests that "modern amphibians
may have come from two groups, with frogs, toads and salamanders related to temnospondyls, while another type of modern amphibian - the earthworm-like caecilians - is more closely related to
the lepospondyls, another group of archaic amphibians" (Skrepnick, 2008). What this fossil provides is conclusive proof that "frogs and salamanders have an origin among one particular group of extinct
fossil amphibians," falling in the gap between an "archaic group of amphibians" and modern amphibians, including salamanders and frogs (Scientists, 2008). What all this means is that science has found
a fossil proving a direct link between ancient temnospondyls and modern amphibians; there is no doubt that frogs and salamanders had the same distant ancestor. When it comes to perch,
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