Item #3 of 10

What is different about the referents for anatomical terms used for humans compared to vertebrate animals that walk on all four limbs?

The neuroaxis of a human bends 90 degrees at the back of the head before it runs down the length of the spinal cord.;
The neuroaxis of a non-upright animal bends 90 degrees at the back of the head before it runs down the length of the spinal cord.;
The neuroaxis of a human passes in a straight line from the feet through the top of the head;
The neuroaxis of a non-upright animal passes in a straight line from the tail through the front of the head.;
both a and d are correct;

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