Answer(s):
Thick Fur on a bear: Physiological
Spines on a rose bush: Structural
Hibernating for the winter: Behavioral
Fight or Flight reflex: Behavioral
Deer fighting for a mate: Behavioral
I hope these help and I am sorry if these are wrong. ;-;
Of course not! There's lots of ways materials can enter. It also depends on the cell; whether it has cell wall and cell membrane or only cell membrane.
Besides diffusion, there's also osmosis and active transport.
If the cell has only cell membrane, it means it's partially permeable, which means osmosis can happen.
*hope this helps :)
Solar panels, windmills, hydro energy
The axons that cross from one side of cord to the other before reaching gray matter are the gray commissures. The white columns are interconnected by the anterior white commissure, a region where axons cross from one side of the spinal cord to the other. The white matter between the anterior and posterior columns on each side makes up lateral white column. Each column contains tracts whose axons share functional properties.