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Radial versus bilateral symmetry ... Animals can be either bilaterally or radially symmetrical. An animal is bilaterally symmetrical if there is a single plane that divides it into two mirror images. This contrasts with radial symmetry, which apparently had evolved before bilateral symmetry evolved.
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www.utm.edu/departments/cens/biology/rirwin/symmetry2.h...
www.utm.edu/departments/cens/biology/rirwin/symmetry2.htm
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Cnidarians are generally believed to be radially symmetrical animals, but some cnidarians, such as the sea anemone Nematostella, display bilateral symmetry with an oral-aboral axis and a directive axis, which is orthogonal to the oral-aboral axis.
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www.sciencemag.org/cgi/content/short/304/5675/1207k
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Radial symmetry Sea anemones display radial symmetry.These organisms resemble a pie where several cutting planes produce roughly identical pieces. An organism with radial symmetry exhibits no left or right sides. They have a top and a botto...
http://answers.yahoo.com/question/index?qid=20080511110...
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Other animals have symmetry like a snowflake’s — there are many different ways to carve it into matching halves, and all of these lines meet in the middle, dividing it up like a birthday cake. That is called radial symmetry. ... One character inherited by all arthropods is bilateral symmetry.
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evolution.berkeley.edu/evolibrary/article/_0_0/arthropo...
evolution.berkeley.edu/evolibrary/article/_0_0/arthropods_04
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A tendency toward radial symmetry (the arrangement of body parts as rays) developed early in echinoderm evolution and eventually became superimposed upon the fundamental bilateral symmetry, often obliterating it....
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www.britannica.com/EBchecked/topic/488446/radial-symmet...
www.britannica.com/EBchecked/topic/488446/radial-symmetry
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, either radial symmetry or bilateral symmetry or "spherical symmetry". A small minority exhibit no symmetry (are asymmetric). In nature ... ; Biradial is a combination of radial and bilateral symmetry. Ctenophores is an example of biradial symmetry.
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www.absoluteastronomy.com/topics/Symmetry_(biology)
www.absoluteastronomy.com/topics/Symmetry_(biology)
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There are no planes of symmetry in the asymmetrical form, while the radial form has numerous planes. Bilateral organisms, like humans, have only one plane of symmetry, extending from the head to the toe. Bilateral symmetry is an important step in development of a head and concentration of sensory organs in that head.
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www.emc.maricopa.edu/faculty/farabee/BIOBK/BioBookDiver...
www.emc.maricopa.edu/faculty/farabee/BIOBK/BioBookDiversity_7.html
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No orgaized tissue vs organized tissue ... sponges are animals with no tissues and no symmetry ... Secondary radial symmetry...
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www.uic.edu/classes/bios/bios100/labs/animaldiversity.h...
www.uic.edu/classes/bios/bios100/labs/animaldiversity.htm
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Clark College, Biology 144, Winter 2000; Second Midterm Study Guide; ... Contrast the advantages and disadvantages of radial vs. bilateral symmetry; multicellular vs. unicellular; complete vs. incomplete gut.
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www.vancouver.wsu.edu/fac/tissot/cl/biol144/guide2.htm
www.vancouver.wsu.edu/fac/tissot/cl/biol144/guide2.htm
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