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13 Dec 2019

Which of the following is true of human biological evolution?

Select one:

a. With modern Homo sapiens’ appearance in the late Pleistocene, human biological evolution basically stopped.

b. It has been a linear process taking only 2 million years.

c. Humans are still evolving today.

d. Human evolution can be stopped at any time using cultural means.

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17 Dec 2019
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Which of the below statements is NOT TRUE about human evolution?

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Almost all organs in the human body have a rather largethreshold within which the organ or tissue is capable of repairingitself using materials supplied by the body, whether it's made fromorganic tissue or structural proteins. Wounds and minor damage tothe skin or flesh for example heal by themselves, skin, nails andbody hair can grow back if damaged or removed, even most bones canbe repaired autonomously by a biological body. Cutting off asignificant chunk from the human flesh or removing over 90% of ahair or a nail would cause no permanent injury, and the body iscapable of repairing the damage over time with ease. The vastmajority of the human body (not counting critical organs such asthe heart or the brain) can be "grown back" to an extent by itself,because such parts have a rather large damage threshold.

On the contrary, teeth do not. There is a certain threshold inwhich tooth enamel can be supplied and "repaired" by the body to anminimal degree, but past that point virtually any damage caused toteeth are permanently irreparable by natural means. Which is quitestrange, given how fragile a set of human teeth is, be it chemicalor physical damage. Especially if you take more "artificial" causesinto account. A moderately heavy object aimed towards a humanmouth, for example, can easily render ten to fifteen teethpermanently damaged past the point of recovery within a heartbeat,also causing the said person's digestive process to be heavilyimpaired.

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What is the biological and evolutionary reason behindteeth being so fragile and indisposable?

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