They constitute the natural environment.
Step-by-step explanation:
The natural environment is simply the system of naturally occurring living and non-living things. This means that this system has developed on its own and not by any human interference. This system is constituted of all of the living organisms, air, water, and soil.
All of these things work together. They constantly interact with each other, use each other, affect each other, change each other. With other words, everything in the natural environment is connected and dependent on each other. While this system is highly complex it is also very fragile, as if only one thing is removed from it or is damaged the consequences will be felt among most of the things.