"During the Quaternary period of the Cenozoic era" is the section of the geologic time scale among the choices given in the question that <span>the first modern human evolved. The correct option among all the options that are given in the question is the second option or option "B". I hope the answer helps you.</span>
The right answer is myelin.
Vitamin B12, also called cobalamin is a vitamin B group, so it is water soluble. It is a very important vitamin for the functioning of the brain, the nervous system and in the synthesis of DNA. This vitamin must be provided by the diet, the populations most at risk of deficiency are vegans as well as the elderly because of their low consumption of food of animal origin.
Vitamin B12 is essential for the good health of the nervous system: It is particularly at the level of the myelin sheath that vitamin B12 plays a role in thus participating in the protection of nerve cells.
Gill ridges and a bony tail....
One valid inference that can be made regarding the evolution of modern horses is that : Pliohippus had teeth adapted for grazing
<h3>Description of Pliohippus </h3>
From the information provided in the question The modern day horse resembling the pliohippus can be inferred to have teeth which is adapted for grazing just like the pliohippus.
The pliohippus evolved from the merychippus which is classified as a grazer. because of its longer/taller teeth the pliohippus was more adapted to grazing than been a browser.
Hence we can conclude that One valid inference that can be made regarding the evolution of modern horses is that : Pliohippus had teeth adapted for grazing
Learn more about modern day horses : brainly.com/question/688848
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