The heads are the ones that like water and the tails dont
Answer:
Parasympathetic and Sympathetic branches of the autonomic nervous system
You can classify them in what phase they are in: solid, liquid, gas
You can classify them in Sizes
You can classify them by the number of moons they have
You can classify them by distance from the sun
You can classify them all as heliocentric or orbiting/circling around the sun
You can classify them by color
Answer: There are 206 bones in the human adult body, but 270 bones at birth.
