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No, they are not. There is always some side difference between the two. For humans, there is the fact of handedness. One hand is dominate and that side will always be larger. The fingernails on that side will grow faster.
Inside the body, there is even a larger difference. The heart actually lays on the dome of the diaphragm and is mostly to the left. The lungs are different sizes, there are two lobes on the left side and three on the right. The liver has two lobes, the much larger one is left and the smaller is right. The left kidney is higher than the right. There is more of the colon on the left. The appendix is on the right. The gall bladder is on the right and most of the stomach is mostly on the left.

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Do vertebrates have equal sides of the body?

All vertebrates display bilateral symmetry.


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The anatomical term that divides the body into left and right sides is the "sagittal plane." This vertical plane runs from front to back and can create equal left and right halves when it is specifically referred to as the "midsagittal plane." Any plane that divides the body into unequal left and right portions is known as a "parasagittal plane."


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The plane that passes through the body from front to back, dividing it into right and left sides, is called the sagittal plane. It runs vertically and can be further classified into the midsagittal plane (which divides the body into equal right and left halves) and parasagittal planes (which divide it into unequal parts).


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