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WHAT IS MEANT BY BILATERALLY SYMMETRICAL ANIMALS?
In bilaterally symmetrical animals, the body is organized along a longitudinal axis, with the right half an approximate mirror image of the left half.  Bilateral symmetry makes possible more efficient movement than does radial symmetry, which is typically found in animals that move slowly or are sedentary.
    A bilaterally symmetrical animal also has a dorsal (top) and a ventral (bottom) surface.Most bilateral organisms also have distinct anterior (head) and posterior (tail) ends.  Having one end that goes first is characteristic of actively moving animals.Bilateral animals are all triploblastic, meaning they have three embryonic tissue layers that give rise to the various specialized tissues of the adult animal.


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