This is due to the fact that there is little food (flying insects) for them to eat. If they stayed awake in a warm home, without hibernating, then they would starve. We can begin the bat exclusion process during the winter months.
Mean free path of molecules in a gas. The molecules in a gas are assumed to be in continuous random motion making collisions with each other and with the walls of the container. The mean distance that the molecules travel between one collision and the next is called the mean free path of the molecules.
Through the process of simple diffusion. Compare and contrast how an ion is transported across the plasma membrane versus how a small, polar molecule is transported. Ions are transported through channels (leak or gate), by means of simple or facilitated diffusion down a concentration gradient. A small, polar molecule is transferred through carrier-mediate diffusion by carrier proteins, which change shape to move the molecule through the plasma membrane.