Answer: It is because nature is made of four levels: inanimate, vegetative, animate, and speaking. Still nature is the biggest part and by its great quantity, it creates a new quality, the level of the vegetative.
The vegetative level of nature covers all of the Earth’s surface, but in its great amount, it expresses only one attribute, the animate.
On the other hand, although there are far fewer animals than plants, their great diversity leads to a state in which they become equal to one human being.
This is how everything is arranged. Therefore, there has to be a great amount of still matter that is balanced by a certain amount of the vegetative level of nature.
From the Kabbalah Lesson in Russian 1/29/17