The correct answers are:
- water;
The water is the essential substance used for the functioning of the living organisms. It is included in the process of photosynthesis, as well as for the bodily functions.
- rocks;
They are the mineral base, thus they provide food source. Also, the rocks are the mother material for the creation of the soils.
- air;
The air has to be just right in order for the organisms to survive. Its composition has to be consisted of elements that are useful for the living organisms.
- sunlight;
The sunlight provides heat, thus it enables the formation of suitable environments, as without it, the Earth would be very old and frozen. It is also crucial for the process of photosynthesis.
