Symmetry refers to balance. In nature there are three kinds of symmetry. Spherical, radial, and bilateral. The absence of symmetry is called asymmetry. Organisms in the animal kingdom with symmetry exhibit either radial or bilateral symmetry.
In radial symmetry the organism exhibits a circular arrangement with numerous planes that create identical parts. Radial symmetry is analogous to a pie in which the organism may be cut in several planes with each part (piece of pie) being identical. A organism with radial symmetry exhibits no left or right sides. It has a top (oral surface) and a bottom (aboral surface). Animals in the phyla cnidaria and echninodermata exhibit radial symmetry.
LIKE A SEASTAR
In bilateral symmetry a organism can be divided in only one plane producing two mirror image halves. (Note that we are only referring to the external surface when discussing symmetry.) This division produces a left and right side. It is found in animals with cephalization (concentration of sensory organs in the head). These animals move in the direction of their head.
LIKE HUMANS
2006-08-28 15:01:44
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answer #1
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answered by Anonymous
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radial - round or having a central axis that may have many projecting legs, appendages or flagella.
bilateral - two sides of equal proportion.
asymmetrical -two sides that are not exactly equal in proportion.
Starting with a definition always helps. These came off the top of my head, but I know they are accurate.
I went to school when there was no Internet! Now, pick up that text book and get cracking! When you learn for yourself information stays in your head forever!
2006-08-28 14:59:39
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answer #2
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answered by Chris 5
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radial: starfish
bilateral: humans
asymmetrical: trees
2006-08-28 14:55:29
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answer #3
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answered by Bethany 7
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asymmetrical............amoeba, bilateral is fish, and radial is star fish.
2006-08-28 14:54:33
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answer #4
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answered by weirdoonee 4
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I dont wanna make your home work. Go to google.
2006-08-28 14:53:56
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answer #5
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answered by odacrem69 3
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radius 2x fit
2006-08-28 14:55:37
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answer #6
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answered by Penney S 6
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DO YOUR HOMEWORK!
I'M WATCHING YOU.
><
2006-08-28 14:53:16
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answer #7
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answered by Yinzer from Sixburgh 7
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