The skin and the liver are two organs that would be easy for stem cells to repair. What would be difficult to repair would be the apical meristem and the lateral.
Answer:
https://phys.org/news/2009-05-bird-songs-environment.html
Explanation:
Organic molecules, which are found mostly in food. These molecules have C-C or C-H bonds, which are high energy bonds.
For the answer to the question above, I believe the answer is that the bones get or have a greater risk for bone fracture <span>if calcium is not replaced in bone tissue. The bones could become more brittle. For women, they can suffer from Osteoporosis. </span>
That they are both theories of evolutionary change, but the tempo of the change is different enough that we have the two theories. Rapid evolutionary change punctuated with long periods of stasis describes the former while gradual and incremental change over long periods is the description of the later. Natural selection seems to be more important in gradualism than punctuation, but this is <span>a murky area that is argued about often.</span>
