The next level above this is plant, while plant life does grow it also possess limited movement. Animal life is even loftier, besides growth, it has almost unlimited movement and a limited ability to communicate. Man, being the crown of creation, has both growth and unlimited movement, plus the ability to communicate sophisticated ideas. Although the rock is considered to be the lowest level and man the highest level, still we must realize that there are aspects in the lower level that the higher levels do not possess. The inanimate requires no support from the higher levels, yet it gives freely from itself to the higher levels.
Plant life dissolves the rock and assimilates it into itself transforming it into plant.
The plant also serves the level above it which can not exist from rock, by becoming food for the animal level. In this manner, even the rock which has been utilized by becoming plant is digested by the animal and assimilated in its body. Man, who can not eat all plants, is able to eat these animals thereby assimilating in his body all of the lower levels. Now we know that nothing is ever with out a reason in the Torah, after all the Torah is the divine wisdom of G-d as revealed to man on earth. As an example, when a man desires to build a house he must first have the desire to build it.