The main purpose is communication. like when you stub your toe , your nervous system communicates to your brain to react and have pain
Topsoil is the most fertile soil layer for plants.
Solid. it's all stuck and linked together, while liquids are flowing along and gases fly around wherever they please. Hope this helps
Homeostasis is a property of an organism or system that allows its to maintain the controlled parameters within normal ranges. Henry Barbour contributed to the understanding of this concept by his delineation of the reactions of the temperature of the body. This is in line with the same concept that was initially proposed by Claude Bernard.
