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Essay / Research Paper Abstract
This 4 page paper discusses the importance of body cavity as an evolutionary mophological feature. Bibliography lists 3 sources.
Page Count:
4 pages (~225 words per page)
File: AM2_PP674789.doc
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Unformatted sample text from the term paper:
the animal kingdom. A body cavity exist in addition to the gut cavity in the more highly evolved animals. It is external to the gut (Smith, 2010).
Body cavities are present in both the protostomes and deuterostomes. Never-the-less, there are key differences in their embryonic development. Deuterostomes acquire an anus first and then a
mouth during their embryonic development but protostomes develop the mouth first (Bourlat, Juliusdottir, Lowe, et. al., 2006). Despite the many advantages that are
associated with it, some animals have no body cavity. Acoelomate triploblasts, the so-called "solid worms", for example, have only a gut cavity and this fact is related to their
name (Smith, 2010). For the purpose of illustration it is helpful to compare those worms to the common earthworm which does have a body cavity.
The animals that do have a body cavity have certain advantages over those that do not. These animals are characterized by more room for their
internal organs and more internal surface and storage area as well (Smith, 2010). The hydrostatic skeleton that characterizes these animals is of particular benefit (Smith, 2010). Typically animals
with a body cavity are larger than those that have only a gut cavity (Smith, 2010). In the case of the
earthworm we have an animal that is very low on the evolutionary scale yet it is considerably more advanced than an animal like the solid worm largely because of its
body cavity. This worm is in the Annelida Phylum and the Oligochaeta Subclass. It has, in fact, made phenomenal adaptations in terms of survival that are directly
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