Which layer of earth acts as a very effective “insulator,” because it’s made of rock?

Imagine ? person stepping on a pin and pulling his or her foot way look at the réfléchir arc of the scenarios below

The unique structure of the neuron is dedicated to the efficient and rapid transmission of neural signals. the relationship between neurons, the spinal cord, and the brain constitutes an elaborate communication system throughout the human body. all but one of the functions listed below are a result of this interaction.

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?