It should be natural selection since there is no external influence implied. (like environment or genetic mutations.)
<span>The metabolic activity of a specific region of the living rat brain can be revealed by measurement of Fos protein concentration.
c-Fos is a proto-oncogene that is the homolog of the retroviral oncogene v-fos. It was first discovered in rat fibroblasts as the transforming gene of the FBJ MSV.</span>
The limbic cortex. Another area called the precuneus also plays a role.
Pure water freezes at 32 degrees Fahrenheit, and at 0 degrees Celsius.
Hope this helps!
<span>The process when molecules tend to move from an area of high concentration to an area of low concentration is diffusion! I hope I helped :D</span>
