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In animals
29/05/2019
In animals
The symmetry can be radial, bilateral or apparently bilateral. In animals with bilateral symmetry, like insects or ourselves, the right and left halves of the body are specular, although not totally. In the internal organization there is a certain asymmetry, to which we must have the liver on the right side and the stomach on the left.
Within the animal world, the most widespread is the predominance of right laterality, both anatomical and psychic. The majority of conch shell species, both terrestrial and marine, coil to dextrosum, that is, they roll to the right, which causes that the vast majority of predatory crabs that introduce their claw into the shell to extract them, are right-handed. Many primate populations also exhibit a preference for one hand. It is common to say that polar bears are left-handed.
This lateral predominance has been speculated that evolutionarily it is very early in the species, going back to invertebrates that already had a shell, like mollusks. Apparently it was due to the ease of electrically charged calcium salts, to crystallize in a specific context that evolutionarily favored right-handed individuals or symmetry of right-handed winding.
The symmetry can be radial, bilateral or apparently bilateral. In animals with bilateral symmetry, like insects or ourselves, the right and left halves of the body are specular, although not totally. In the internal organization there is a certain asymmetry, to which we must have the liver on the right side and the stomach on the left.
Within the animal world, the most widespread is the predominance of right laterality, both anatomical and psychic. The majority of conch shell species, both terrestrial and marine, coil to dextrosum, that is, they roll to the right, which causes that the vast majority of predatory crabs that introduce their claw into the shell to extract them, are right-handed. Many primate populations also exhibit a preference for one hand. It is common to say that polar bears are left-handed.
This lateral predominance has been speculated that evolutionarily it is very early in the species, going back to invertebrates that already had a shell, like mollusks. Apparently it was due to the ease of electrically charged calcium salts, to crystallize in a specific context that evolutionarily favored right-handed individuals or symmetry of right-handed winding.
