How do these mechanisms help the soecialized cells in a body tissues to function?

Matthew decided he wanted to hike up mount everest. on his way to the top, it began to snow and the temperature dropped to -10°f. matthew forgot to wear a heavy jacket so his body began to shiver beyond control. in this case, matthew's body shivering is the to a drop in temperature. * 0 points reflex stimuli responce environmental facto

Climate like that in the sahara desert have the fastest rates of weathering

In general, characteristics that an organism survive and reproduce become more common in a population over time. what mechanism of evolution cause this change?